Muscles of the Arm: O/I/I/A
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Biceps Brachii | Short head: tip of the coracoid process of the scapula; Long head: supraglenoid tubercle of the scapula | Tuberosity of radius and fascia of the forearm via the bicipital aponeurosis | Musculocutaneous nerve (C5, C6*) | Supinates forearm, and when it is supine, flexes forearm; Short head resists dislocation of the shoulder
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| Brachialis | Distal half of the anterior surface of the humerus | Coracoid process and tuberosity of the ulna | Musculocutaneous nerve (C5, C6*) | Flexes forearm in all positions
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| Coracobrachialis | Tip of the coracoid process of the scapula | Middle third of the medial surface of the humerus | Musculocutaneous nerve (C5, C6*, C7*) | Helps flex and abduct arm; resists dislocation of shoulder
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| Triceps Brachii | Long head: infratubercle of scapula; Lateral head: posterior surface of the humerus, superior to radial groove; Medial head: posterior surface of the humerus, inferior to the radial groove | Proximal end of olecranon of ulna and fascia of forearm | Radial nerve (C6, C7*, C8*) | Chief extensor of forearm; long head resists dislocation of humerus; especially important during abduction
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| Anconeus | Lateral epicondyle of humerus | Lateral surface of olecranon and superior part of the posterior surface of the ulna | Radial nerve (C7, C8, T1) | Assists triceps in extending forearm; stabilizes elbow joint; may abduct ulna during pronation
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Created by:
jenniferm2007
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