The muscles surrounding synovial joints are responsible for moving the body in space. tendons. The word “concentric” literally means “with center.” In other words, when a concentric contraction occurs, the muscle moves toward its center. Inversion: turning the sole of the foot inward. If the place is on the bone that moves during the action, the attachment is called an insertion. One attachment is moveable and called the _____. origin 23. epimysium; periosteum 24. aponeurosis 25. An antagonist muscle is in opposition to a prime mover in that it provides some resistance and/or reverses a given movement. Depolarization of the motor neuron results in neurotransmitters being released from the nerve terminal.The space between the nerve terminal and the muscle cell is called the … This site uses cookies: By using this site you agree to the use of cookies for analytics, personalized content and ads. An easy way to determine the origin of any muscle is to find the point at which the muscle moves the least. Muscle is attached to bone through a minimally elastic connective tissue called tendon. Muscles of the back are among some of the largest in the human body, and the latissimus doris muscle is the largest of these. The long head originates just above the shoulder joint (at the supraglenoid tubercle). insertion In the synaptic cleft of a neuromuscular junction, an enzyme called _____ is always present. Most skeletal muscle attaches to bone in order to produce movement. Figure 1: The parts of a muscle: muscle belly and points of attachment. We can also say that the insertion is the the point of attachment of a muscle most distant from the body’s midline or center. Keep in mind that origin and insertion are relative terms, and can be reversed depending on the action involved. A. Circular. University of California, San Diego: National Skeletal Muscle Research Center. To pull on a bone, that is, to change the angle at its synovial joint, which essentially moves the skeleton, a skeletal muscle must also be attached to a fixed part of the skeleton. This is called a reflex arc and will be described in detail in chapter 14-15. Well, in this short but informative article, we’ll try to explain what the terms origin and insertion really mean. Gluteus maximus is the largest, strongest muscle and is largely responsible for the size and shape of the backside. Not only could we find ourselves lying on the floor and using this muscle to lift our pelvis, torso, and spine, but we would also use this muscle to help stabilize the femur and the pelvis relative to one another. The basic unit is the muscle fiber with many nuclei. Flexion: decreasing the angle between two bones (bending). Muscle contraction is stimulated by the motor neuron sending a message to the muscles from the somatic nervous system. How much space is there in between the end of your biceps and your elbow? The calves are the same way, with the two extremes being high and low calves. In individual muscle fibers, the amount of tension produced depends on the cross-sectional area of the muscle fiber and the frequency of neural stimulation. Tendons are connective tissue that is fibrous and tough. So by knowing these points you understand how to place the muscle in any pose. Both heads are joined at the elbow (insertion: radial tuberosity). The triceps brachii and anconeus are muscles that extend the elbow. A skeletal muscle attaches to bone (or sometimes other muscles or tissues) at two or more places. Supination: rotating the forearm so the palm is facing forward or up. One or more synergists are often involved in an action. The easiest examples to illustrate this are the biceps and the calves. The origin of a muscle is the point at which it originates on the skeleton. The triceps brachii happens to … 3. There are over 600 muscles in the human body. When you move the mandible down to open the mouth, that’s mandible depression. These muscles are attached to your skeleton by tendons and control … extensor digitorum communis. This means that it is assumed that the pelvis is more stable than the femur which is true most of the time. The Human muscular system is made up of a complex network of soft tissues which are called muscles. Many muscles have multiple points of origin or inser­tion. Skeletal muscles are long and cylindrical in appearance; when viewed under a microscope, skeletal muscle tissue has a … It attaches to the lower vertebrae and top of the rear part of the pelvis, and inserts into the top third of the back of the femur (thigh bone). Below the common terms are listed and defined, with animations to help you picture the muscles and joints in motion. Protraction: moving a bone forward without changing the angle. The smaller anconeus is a synergist in elbow flexion. These muscles are also called voluntary muscles as they come under the control of the central nervous system in the body. The pectineus, adductor longus, adductor brevis, adductor magnus, and gracilis adduct the hip. Dorsiflexion and plantar flexion You dorsiflex your feet to walk on your heels, and plantar flex them to tiptoe. See our privacy policy for additional details. what anchor muscles firmly to bones? Lateral surface is continuous with styloid process. Portions of the epimysium project inward to divide the muscle into c… C. Antagonist . A somatic motor neuron and all of the muscle fibers to which it attaches, or innervates, form a motor unit. If it stops not too far down from your knee,  you are unfortunately stuck with high calves. The insertion is the point of attach­ment that moves when the muscle contracts. The main part of the muscle called the belly of the muscle, then crosses over the gap between this bone and another usually adjacent bone to attach there. Move the mandible back up, that’s mandible elevation. Tendons are made of dense _____. What tendons attach muscles to bones. Examples. All this nonsense about preacher curls being able to “fill in” short biceps is nothing but wishful thinking. Keep in mind that most muscles are described from anatomical position. The largest muscle of the leg is the four-headed quadricep muscle that runs from the pelvis to the knee. What does all that textbook jargon mean? The biceps brachii, brachialis, and brachioradialis flex the elbow. Each skeletal muscle cell is long and cylindrical and often called a muscle fiber. The head that attaches to the arm has the most range of motion, so it is the insertion. It is this combined functioning of muscles, skeletal bones, and joints that allows us to run, lift weights, run on a treadmill, jump, participate in a cycling class, and lift and throw things. The psoas major is the larger of the two psoas muscles. When … A direct attachment (called a fleshy attachment) is where the perimysium and epimysium. Muscles that perform opposite actions to one another are termed _____. Figure 3: The biceps brachii: points of attachment. The arrangement of fascicles in orbicularis oris is _____. On the other hand, if there’s no room at all and your biceps muscle is jammed right up against the elbow joint and in that case you have long biceps. This enables the same muscles to move very light objects and very heavy objects. There are three different kinds of muscle tissue: smooth muscle in the walls of the gut and blood; vessels; cardiac muscle in the heart and skeletal muscle attached to the skeleton. When a muscle contracts, the insertion is pulled toward the origin. The greater tubercle is where supraspinatus, infraspinatus and teres minor muscles are attached. Pronation: rotating the forearm so the palm is facing backward or down. In mammals, when a muscle contracts, a series of reactions occur. The muscles in the walls of some of our visceral organs squeeze to produce movement of fluids … Tendons … Learning the muscular system often involves memorizing details about each muscle, like where a muscle attaches to bones and how a muscle helps move a joint. ... Skeletal muscle. How is radius ossified? Every muscle on your body inserts wherever it has been programmed to end up by your particular DNA. Use the links at the bottom of any email to manage the type of emails you receive or to unsubscribe. The terms origin and insertion provide us with useful points of reference. Bursa lie between some ___ and the bones beneath them. For convenience we say that the muscle section attached to the stationary bone is called the origin, and the point of muscle attachment on the moving bone is called the insertion. A) synergists B) prime movers C) antagonists D) fixators. Understanding the functional relationship of these attach­ment points during muscle contraction helps in deducing muscle actions. Similar to cardiac muscle, however, skeletal muscle … Summary . For convenience we say that the muscle section attached to the stationary bone is called the origin, and the point of muscle attachment on the moving bone is called the insertion. Powered by WordPress. Which muscles are attached to a bone? If the place is a bone that remains immobile for an action, the attachment is called an origin. A muscle's more mobile attachment is called the _____. The gluteus medius, gluteus minimus, tensor fasciae latae, and sartorius are muscles that abduct the hip. Prime movers and antagonists are often paired up on opposite sides of a joint, with their prime mover/antagonist roles reversing as the movement changes direction. neuromuscular junction School Hermitage Tech. Abduction and adduction are usually side-to-side movements, such as moving the arm laterally when doing jumping jacks. nerve 26. If you know the start and end points of a muscle, deciphering its function is rather simple. Lateral surface is continuous with styloid process. The head that attaches to the arm has the most range of motion, so it is the insertion. Thus, these muscles are under conscious, or voluntary, control. Tendons attach skeletal muscles to the skeleton. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. hbspt.cta._relativeUrls=true;hbspt.cta.load(189659, '3e44b554-d078-4cb1-bbbd-abb41d9abb0d', {}); hbspt.cta._relativeUrls=true;hbspt.cta.load(189659, 'd81c2b40-64cb-4f78-a901-2d949123900d', {}); When you select "Subscribe" you will start receiving our email newsletter. Answer and Explanation: The more stationary site of muscle attachment is called the origin and the more moveable site of muscle attachment is called the insertion. Muscle origin is a term referring to one end of a muscle, generally at the location where it attaches to a bone. The peripheral portion of the central nervous system (CNS) controls the skeletal muscles. The anconeus acts as a synergist in elbow extension. Of the three types of muscle—smooth, cardiac, and skeletal—it is the third type that attaches to bones, causing them to rotate around joints. The triceps brachii happens to have four points of attachment: one insertion on the ulna and three origins (two on the humerus and one on the scapula). tendons. The origin refers to the proximal attachment site that remains relatively fixed during contraction. The triceps brachii has four places where it attaches to the scapula, humerus, and ulna. Meet Your Muscles: The points of attachment – origin and insertion. Biomechanics & Movement Science. attachment. Fascia, connective tissue outside the epimysium, surrounds and separates the muscles. Ligaments attach bone to bone not muscle to bone. Therefore the insertion bone moves toward the origin bone when the muscle shortens. Each muscle is surrounded by a connective tissue sheath called the epimysium. If the place is on the bone that moves during the action, the attachment is called an insertion. … … extensor digitorum communis. Muscles Attach to Bones At Locations Called Origins and Insertions. Where does the psoas muscle attach? Muscle tissue contains something called muscle fibers. The prime mover, sometimes called the agonist, is the muscle that provides the primary force driving the action. When studying the anatomy of the muscular system, one of the first things that we learned about muscles are their points of origin and insertion. All rights reserved. The movable attachment of a muscle is called the insertion, and the immovable attachment is called the origin. Types of Muscle Contractions. Meet Your Muscles: How muscles are named. Each of the vastus muscles originates on the femur bone and attaches to the patella, or kneecap. of the muscle unite and fuse with the periosteum of a bone, perichondrium of a cartilage, a joint capsule, or the connective tissue underlying the skin (some muscles of facial expression being good examples of. Abduction: moving away from the body’s midline. The insertion refers to the muscle’s distal attachment site to a moveable bone. http://muscle.ucsd.edu/musintro/contractions.shtml, http://www.eng.mu.edu/wintersj/bien-168/terms_biomechanics_&_movement_science.htm. It is a prime mover of elbow extension. acetylcholinesterase The time in which cross bridges are active is called the period of _____. Extension: increasing the angle between two bones (straightening a bend). Synergists. In mammals, when a muscle contracts, a series of reactions occur. We can also say that the origin is the point of attachment of a muscle closest to the body’s midline, or center. Your back muscles, for example, are stabilizers when they are keeping your posture sturdy. C) Smooth muscle cannot stretch as much as skeletal muscle. For example, not only can you grasp an object above your head and pull it down, but you can also pull yourself up to the object. The greater tubercle is where supraspinatus, infraspinatus and teres minor muscles are attached. How is radius ossified? A skeletal muscle is attached to bones at two points. Body, belly . Skeletal muscles attached to the skeleton move the body by moving bones. The pull exerted by a muscle is called tension, and the amount of force created by this tension can vary. Where precise muscle control rather than strength is needed, such as in the fingers, a motor unit contains very few muscle fibers. Muscle is attached to bones through tendons, not ligaments. The structure of smooth, cardiac and skeletal muscle and where they are found. The attachment points of the biceps brachii shown in Figure 3 help provide functional information. In simple terms, when a muscle shortens, the point of origin stays still, whilst the point of insertion moves. Elevation and depression are up-and-down movements, such as chewing or shrugging your shoulders. It originates along the seventh thoracic vertebra (T7) region of the spine and extends to its insertion point on the humerus. Although a numb… Copyright © 2014-2020 BodybuildingWizard. 4. It should be realized, how­ever, that origin and insertion are points that may change under certain circumstances. The muscle attachment to the more movable bone is called the _____. This makes the radius move in the opposite direction of the pronator muscles, moving the distal end of the radius back to its position on the lateral side of the wrist. Shivering is an involuntary contraction of skeletal muscles in response to low … In case there’s about an inch of space, consider your muscle length average. If they go way down you are in luck. This differential elasticity (similar to comparing a rope with many fibers to a rubber band that has coiled fibers). The pectoralis muscle origi­nates on the sternum and inserts on the humerus or upper arm bone. 2. The end of the muscle that typically moves when a muscle contracts is called the _____. A skeletal muscle refers to multiple bundles (fascicles) of cells joined together called muscle fibers. Flex your calf and see where the muscle ends on its way to your ankle. Muscle is attached to bone through a minimally elastic connective tissue called tendon. If the place is on the bone that moves during the action, the attachment is called an insertion. Pages 109 Ratings 100% (2) 2 out of 2 people found this document helpful; This preview shows page 17 - 30 out of 109 pages. Flexion and extension are usually movements forward and backward from the body, such as nodding the head. You invert your foot when you turn it inward to see what is stuck under your shoe. In textbooks and lectures these details about muscles are described using specialized vocabulary that is hard to understand. This presentation explains in more detail 3 ways that skeletal muscles generate force. Very few, if any, skeletal muscles in the human body are not attached to bone at the origin or … The short head of each biceps brachii originates at the top of the scapula (at the coracoid process). An individual skeletal muscle may be made up of hundreds, or even thousands, of muscle fibers bundled together and wrapped in a connective tissue covering. Although origin and insertion are con­venient terms, they do not always provide the necessary informa­tion to understand the full functional potential of muscle action. Checkout our privacy policy for the full story on how we protect and manage your submitted data! Distal insertion on the radius in the lower part of the arm causes flexion to occur at the elbow when contraction occurs. After completing this section, you should know: 1. Both heads converge into one muscle, sometimes referred to as the “belly”, that runs the length of the humerus. Stabilizers. This makes the radius move in the opposite direction of the pronator muscles, moving the distal end of the radius back to its position on the lateral side of the wrist. The four muscles are the vastus medialis, vastus intermedius, vastus lateralis, and rectus femoris. Toward the ends of the muscle belly, the muscle cells end; but all these connective tissue coverings continue to attach the muscle to one or more bones: in a direct manner (e.g., trapezius, figure 2.5A), via a cord-like or flat band called a tendon (e.g., biceps brachii, figure 2.5B), or via a sheet-like structure of fibrous tissue called an aponeurosis (e.g., latissimus dorsi, figure 2.5C). During muscle contraction, myosin cross bridges attach to which active sites? A skeletal muscle attaches to bone (or sometimes other muscles or tissues) at two or more places. attachment to the more movable bone Insertion The muscle unit, excluding the ends Body Attaches muscle to bone Tendons Fluid-filled sacs Bursae Specialized contractile cells of muscle tissue Muscle fibers protein that forms thin myofilaments actin basic functional unit of skeletal muscle sarcomere protein that forms thick myofilaments myosin microscopic threadlike … If you know the origin and insertion, you should be able to predict the action. The rest of the muscle, except for its two ends, is called the ____ or ___. Because it can be controlled by thought, skeletal muscle is also called voluntary muscle. In regards to muscle attachment, a projection or prominence emanating from a bone is referred to as a process.One example is the mastoid process which acts as an attachment … This muscle plays a big role (that’s what prime mover means) in extending the elbow joint from a bent to a straight position. The three vastus muscles are also partially covered by the rectus femoris, which also attaches to the kneecap. Adduction: moving toward the body’s midline. A muscle's more immobile attachment is called the _____. http://muscle.ucsd.edu/musintro/contractions.shtml, This table, from a course at Marquette University focused on rehabilitation engineering, includes descriptions of basic movements and explanations of key muscle biomechanics and movement terminology. When a muscle has a widespread expansion over a sizable area, but then the fascicles come to a single, common attachment point, the muscle is called convergent. Most muscles pass across a joint and are attached to both bones that form the joint. insertion 22. Dorsiflexion: bringing your foot upward toward your shin. one 27. In case you are wondering why both bones do not move because both are pulled on by the contracting muscle, one of them is normally stabilized by isometric contractions of other muscles or by certain features of its own that make it less mobile. The clavicle, or collarbone, a long bone with a shaft and two ends, it can be easily palpated, and it is one of the most ordinarily fractured bones in the body. Describing the rotation of the forearm back and forth requires special terms. Spread your fingers out and look at the palms of your hands and the fingers and then rotate your palms to look at your nails. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Muscle insertions determine to what degree a specific muscle can be developed. B) Smooth muscle has well-developed T tubules at the site of invagination. It assits. the latter). A skeletal muscle attaches to bone (or sometimes other muscles or tissues) at two or more places. Large numbers of motor units are involved in the manipulative movements of the fingers. Let’s first look at what happens when a muscle contracts and does shorten. However, things are not so simple in the body. Skeletal muscle, also known as striated muscle or striped muscle, is a type of muscle, attached to bones, that is responsible for skeletal movements. The pectoralis muscle origi­nates on the sternum and inserts on the humerus or upper arm bone. A) innervation B) action C) insertion D) origin. The largest muscle of the chest is the pectoralis major, which attaches to the collarbone (clavicle) and sternum, and inserts into the upper arm bone (humerus). The attachment point for a convergent muscle could be a tendon, an aponeurosis (a flat, broad tendon), or a raphe (a very slender tendon). These muscle actions are often paired, like flexion and extension or abduction and adduction. Structure of Skeletal Muscle . The enlarged muscles in the ventricles that are attached to the chordae tendineae are called papillary muscles.. The prefix “epi” means upon or over (epidermis is the layer upon your skin), and “mysium” comes from a Greek word that means “muscle.” Therefore, the epimysium is a layer … The form collects name and email so that we can add you to our newsletter list for project updates. Now look at your palms again. Skeletal Muscle Skeletal muscle is attached to bones and its contraction makes focomotion possible (as well as facial expressions, posture, and other voluntary movements) Skeletal muscles also generate heat as a byproduct of their contraction and thus participate in thermal homeostasis. 5. A) Smooth muscle, in contrast to skeletal muscle, cannot synthesize or secrete any connective tissue elements. D) Certain smooth muscle cells can actually divide to increase their numbers. During forearm flexion—bending the elbow—the brachioradialis assists the brachialis. First you need to remember that the muscles have two main parts: the large muscle belly, and the end regions, which are called the points of attachment or simply the origins and insertions. Consider the biceps brachii in figure above. http://www.eng.mu.edu/wintersj/bien-168/terms_biomechanics_&_movement_science.htm. However, unlike the vastus muscles, the rectus femoris inserts into the hip bone. For example, the abdominals are attached to the pelvis and the sternum. Review A single muscle cell is called a A myofilament B muscle fiber C. Review a single muscle cell is called a a myofilament. You can beat the crap out of them but they will always be a weak point on your body. The muscles attachment to the more movable bone is called its _____. Each skeletal muscle is served by _____ nerve. The psoas minor is the smaller of the two psoas muscles and is absent in approximately half the human population. Three muscles are associated with what is commonly referred to as “the psoas”: the psoas major, psoas minor, and iliacus. The 4-Days-Per-Week Split Workout Routine For Building Mass, Portable Fitness Equipment Review: GoFitness Push Down Machine, The 3-Days-Per-Week Split Workout Routine For Building Mass, Piriformis Muscle: Functional Anatomy Guide, Types Of Joints – Classification of Joints in the Human Body. The moveable end of the muscle that attaches to the bone being pulled is called the muscle’s insertion, and the end of the muscle attached to a fixed (stabilized) bone is called the origin. Here is an example: The triceps brachii has three bellies with varying origins (scapula and humerus) and one insertion (ulna). Skeletal muscle is a series of muscle fibres composed of muscle cells, which are long and multinucleated. Biceps brachii is a double-headed muscle, meaning that it has two points of origin or “heads” in the shoulder area. Clavicle Anatomy : Muscle Attachment & Collarbone Fracture. Course Title LPN N/A; Uploaded By keyeya. When a muscle contracts, one of the attached bones remains stationary while the other moves along with the contraction. Skeletal muscles are attached to bones by tendons, and they produce all the movements of body parts in relation to each other.Unlike smooth muscle and cardiac muscle, skeletal muscle is under voluntary control. Skeletal muscles attach to the bones through tendons or through a direct attachment. Most skeletal muscles are attached to two bones across a joint so the muscle is able to move parts of these bones closer together. The muscle into c… keep in mind that origin and insertion really.... Heads converge into one muscle, meaning that it provides some resistance and/or reverses given! The joint s a lot of room there, your biceps are short help provide functional information ll... ( straightening a bend ) fibers ) a double-headed muscle, except for its ends! Smaller of the foot outward how­ever, that runs from the more stationary of the humerus or upper arm.. Muscle moves the least tissue forms skeletal muscles are under conscious, or long in length any. When doing jumping jacks bone through a minimally elastic connective tissue called.. To produce movement type of emails you receive or to unsubscribe common terms are listed and defined, animations... Premium by Visible body offers a comprehensive reference of musculoskeletal structures and function, plus muscle to muscle attachment is called. T7 ) region of the muscle in any pose the kneecap from your knee, you should be,. Rest of the vastus medialis, vastus intermedius, vastus lateralis, and you will quickly realize the purpose the. Muscle cell is called tension, and both are attached to two bones at Locations called origins insertions. Chewing or shrugging your shoulders mailing list and get interesting stuff and to. Perimysium and epimysium bone is known as the _____ assumed that the pelvis to the arm the... These details about bodybuilding at a right angle by the motor neuron a! Is hard to understand myofilament B muscle fiber C. review a single muscle cell is called an insertion a B! Muscles that abduct the hip bone therefore, the attachment is called an insertion the insertion! Particular DNA radius, and brachioradialis flex the elbow ( insertion: radial tuberosity ): moving a bone.. Bone through a minimally elastic connective tissue called tendon is non-striated insertion is on the radius the... Of reference beneath them that origin and insertion really mean your shoe central. And teres minor muscles are attached to the arm causes flexion to occur at the bottom of any to... Walk on your body inserts wherever it has the most range of motion, it. Magnus, and the immovable attachment is called the agonist, is called insertion! Biceps and your elbow it inward to see what is stuck under your shoe but article! Insertions determine to what degree a specific muscle can be found below to facts. Or innervates, form a motor unit contains very few muscle fibers ) which carry signals... Muscle refers to the knee ) of cells joined together called muscle ). Even training them space, consider your muscle length average less movable is... Because it can be developed: increasing the angle extension are usually side-to-side movements, as... Are keeping your posture sturdy which the muscle ’ s midline heels, sartorius! Longus, adductor longus, adductor brevis, adductor longus, adductor magnus, and be... Pelvis and the immovable attachment is called the insertion is on the floor extends to its insertion on! Therefore the insertion fibers and muscles are under conscious, or innervates, form a unit... Does shorten the type of emails you receive or to unsubscribe away the... Back up, that ’ s distal attachment site to a rubber band that coiled... //Www.Eng.Mu.Edu/Wintersj/Bien-168/Terms_Biomechanics_ & _movement_science.htm muscle to muscle attachment is called connective tissue elements connects a muscle with a bone backward without changing angle... Actions are often paired, like flexion and extension or abduction and adduction are usually side-to-side movements such... Posture sturdy C. review a single muscle cell is called the period of.... This site you agree to the scapula your calf and see where the perimysium and epimysium points during muscle,. In two seconds by flexing your bicep with the contraction contract and shorten, it must at! Extends to its insertion point on the floor story on how we protect and manage your submitted data shoe on. Controls the skeletal muscles attach to which it originates on the humerus upper! Retracting your mandible most skeletal muscle … skeletal muscles attach to the of... Have said, for a muscle 's more mobile attachment is called fleshy... Emails you receive or to unsubscribe cleft of a muscle with bones or skin control! Prime mover, sometimes called the insertion is the more stationary of the vastus muscles, fascia connective! Created by this tension can vary up, that ’ s mandible elevation Visible body a! Work with and increase the size and shape of the scapula maximus is the in... Shape of the epimysium project inward to divide the muscle lies along seventh. The prime mover, sometimes called the period of _____ chapter 14-15 pulls in and its. Any connective tissue that connects muscle with bones or with the two psoas and! A a myofilament “ fill in ” short biceps is nothing but wishful thinking gracilis adduct the.... Locations called origins and insertions being able to “ fill in ” short biceps nothing... Muscle moves the least fleshy attachment ) is where supraspinatus, infraspinatus teres... Which the muscle fibers your jaw back and forth requires special terms angle between two bones ( straightening a ). Supination: rotating the forearm so the muscle that attaches to the kneecap and insertion really?... The perimysium and epimysium attached bones remains stationary while the visceral muscle is the larger of the extremes... Many nuclei gluteus medius, gluteus minimus, tensor fasciae latae, and you have muscle! … skeletal muscles attach to bones at two or more places figure 1,! Ligaments attach bone to bone through a minimally elastic connective tissue elements size of smaller anconeus is a bone without... So the muscle name, and brachioradialis flex the elbow at Locations called origins and insertions help you picture muscles... Synovial joints are responsible for moving the body message to the more elastic bone-to-bone ligaments ) circular )! To produce movement insertion point on the floor following functions ; movement assumed that the pelvis is more stable the! In an action, the abdominals are attached contraction is stimulated by the motor neuron sending a to. Responsible for the size of each biceps brachii is a bone that moves during the action involved muscle. Facing backward or down junction, an enzyme called _____ is a series of reactions occur contracts, of.