The muscle comprises the lateral wall of the cubital fossa and at the same time presents the border between the anterior and posterior forearm compartments. When in motion, muscles take on the role of agonist, antagonist, synergist, or co-contractor. The flexor digitorum superficialis and flexor digitorum profundus flex the fingers and the hand at the wrist, whereas the extensor digitorum extends the fingers and the hand at the wrist. kristie_0413. This happens when the forearm is in either one of those two positions, since brachioradialis tends to bring the forearm back into the semi pronated stance. Brachioradialis Copyright American Academy of Manual Medicine There are three muscles on the upper arm that are parallel to the long axis of the humerus, the biceps brachii, the brachialis, and the triceps brachii. During flexing of the forearm the biceps brachii is the agonist muscle, pulling the forearm up towards the shoulder. Anatomy & Physiology by Lindsay M. Biga, Staci Bronson, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Matern, Katie Morrison-Graham, Kristen Oja, Devon Quick & Jon Runyeon is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted. For example, the teres major muscle, on the medial side of the arm causes shoulder abduction. In this motion the atlanto-occipital joint is the fulcrum, the head is the resistance, and the applied force is generated by the trapezius muscle of the neck. Pennate muscles (penna = feathers) blend into a tendon that runs through the central region of the muscle for its whole length, somewhat like the quill of a feather with the muscle arranged similar to the feathers. Arm Muscles - Action, Antagonist, Synergist Flashcards | Quizlet Recall the discussion about muscles crossing joints to create movement. The function of this action is seen in various ordinary activities such as hammering or rowing. synergist/antagonist on forearm/hand. [2] It is attached to the distal styloid process of the radius by way of the brachioradialis . 13 terms. For example, the agonist, or prime mover, for hip flexion would be the iliopsoas. Each muscle fiber (cell) is covered by endomysium and the entire muscle is covered by epimysium. Action: flexes wrist and middle phalanges towards the palm. synergist and antagonist muscles - afcemley.co.uk
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