BIO_2113__Lab_5_Modified_Limb_Muscular_S

BIO_2113__Lab_5_Modified_Limb_Muscular_S - BIO 2113 Anatomy...

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BIO 2113 Anatomy and Physiology Spring Quarter 2010 Lab 5: Appendicular Muscles Hugh D. Dookwah DVM, PhD Muscles Crossing the Shoulder Nine muscles cross the shoulder joint and insert into the humerus Prime movers include: Pectoralis major – arm flexion Latissimus dorsi and posterior fibers of the deltoid – arm extension Middle fibers of the deltoid – arm abduction Rotator cuff muscles – supraspinatus, infraspinatus, teres minor, and subscapularis Function mainly to reinforce the capsule of the shoulder Secondarily act as synergists and fixators The coracobrachialis and teres major: Act as synergists Do not contribute to reinforcement of the shoulder joint Forearm extension The triceps brachii is the prime mover of forearm extension The anconeus is a weak synergist Forearm flexion Brachialis and biceps brachii are the chief forearm flexors The brachioradialis acts as a synergist and helps stabilize the elbow Muscles of the Forearm Forearm muscle groups: those that cause wrist movement, and those that move the digits These muscles insert via the flexor and extensor retinacula Most anterior muscles are flexors, and posterior muscles are extensors 1
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Muscles of the Forearm: Posterior Compartment These muscles are primarily extensors of the wrist and fingers Muscles of the Forearm: Anterior Compartment These muscles are primarily flexors of the wrist and fingers The pronator teres and pronator quadratus are not flexors, but pronate the forearm The supinator muscle is a synergist with the biceps brachii in supinating the forearm Muscle Action of the Arm: Summary 2
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The posterior extensor and anterior flexor muscles are shown 3
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Intrinsic Muscles of the Hand These small muscles: Lie in the palm of the hand (none on the dorsal side) Move the metacarpals and fingers Control precise movements (e.g., threading a needle)
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This note was uploaded on 06/11/2010 for the course BIOL 2113 taught by Professor Dookwah during the Spring '10 term at Athens Tech.

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BIO_2113__Lab_5_Modified_Limb_Muscular_S - BIO 2113 Anatomy...

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