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Stack #83499

Muscles of the Arm: O/I/I/A

MuscleOriginInsertionInnervationAction
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
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
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
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
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
Created by: jenniferm2007
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