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9 Cards in this Set
- Front
- Back
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Anterior Compartment, Upper Arm: brachialis: main flexor of elbow (not biceps); lies under biceps (p.132) |
O: distal half of anterior surface of humerus I: coronoid process and ulnar tuberosity A: elbow flexion N: musculocutaneous nerve |
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biceps brachii: superficial; two heads; corkscrew effect for supination (p.95) |
O: long head: supraglenoid tubercle (goes through bicipital groove) short head: coracoid process I: radial tuberosity A: elbow flexion, forearm supination; assists shoulder flexion N: musculocutaneous nerve |
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Posterior Compartment, Upper Arm triceps brachii: chief extensor of elbow; long head descends between teres M/m (p.97) |
O: long head: infraglenoid tubercle lateral head: inferior to greater tubercle on posterior humerus medial head: posterior humerus (deep to long and lateral heads) I: olecranon process A: elbow extension; assists shoulder extension N: radial nerve |
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anconeus: no major actions; sometimes considered part of triceps (p.139) |
O: lateral epicondyle I: posterior prox. surface of ulna and lateral, inferior olecranon process A: assists ext? keeps annular lig. from being pinched during extension? stabilizer during pronation and supination? –not a prime mover in any joint action N: radial nerve |
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Lateral Forearm: brachioradialis: (p.133) |
O: lateral supracondylar ridge of humerus I: styloid process of radius A: elbow flexion (most effective in neutral forearm position) N: radial nerve |
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Anterior Forearm: pronator teres: (p.146) superficial just inferior to lat. epicondyle; covered distally by brachioradialis |
O: medial epicondyle of humerus and coronoid process of ulna I: lateral surface of radius at midpoint A: forearm pronation; assists in elbow flexion N: median nerve |
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pronator quadratus: (p. 147) deepest; helps interos. mem. keep bones together with upward force |
O: distal fourth of ulna (medial/anterior surface) I: distal fourth of radius (lateral/ anterior surface) A: forearm pronation N: median nerve |
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supinator: ice cream muscle (p.147-148) |
O: lateral epicondyle of humerus, adjacent ulna (supinator crest) I: proximal (third) of radius (anterior/lateral surface) A: forearm supination N: radial nerve |
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force couple: supinator + biceps brachii |
force couple |
