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Arm and Elbow

attachments, actions, innervations

muscleorigininsertionaction nerve
Coracobrachialis Corocoid process of scapula Middle of medial shaft of humerus Flexes and adducts the humerus Musculocutaneous
Triceps Brachii(3 heads) Long head- Infraglenoid tubercle of scapula Lateral head- Posterior surface of proximal half of humerus Medial head- Posterior surface of distal half of humerus All heads- Olecranon process of ulna Long head- Extends and adducts the shoulder All heads- Extend the forearm (elbow) Radial nerve
Anconeus Lateral epicondyle of humerus Lateral surface of olecronon and superior part of posterior surface of ulna Assist triceps in extending forearm; Stabalize elbow joint; Abducts ulna during pronation Radial nerve
Deltoid Muscle(3 parts) Lateral 1/3 of clavicle, acromion and spine of scapulae Deltoid tuberosity of humerus Ant: Flexes and medialy rotates arm Mid: Abducts arm Post: Extends and laterally rotates arm Axillary nerve
Biceps Brachii(2 heads) Short head- Coracoid process of scapula Long head- Supraglenoid tubercle of scapula Tuberosity of the radius and aponeurosis of biceps brachii Flexes elbow, supinates forearm, flexes shoulder joint Musculocutaneous
Brachialis Distal half of the anterior surface of humerus Tuberosity and coronoid process of ulna Flexes the elbow Musculocutaneous
Created by: mgrills26