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8 Cards in this Set
- Front
- Back
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deltoideus |
ORIGIN: The spine and acromial process of the scapula. INSERTION: The deltoid tuberosity. ACTION: To flex the shoulder. INNERVATION: Axillary nerve. |
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infraspinatus |
ORIGIN: The infraspinous fossa. INSERTION: A small, circumscribed area on the lateral side of the greater tubercle of the humerus. ACTION: To extend or flex the joint, depending on the degree of extension or position of the joint when the muscle contracts. To abduct the shoul- der and to rotate the shoulder laterally. To prevent medial rotation when weight bearing and provide lateral stability to the shoulder joint. INNERVATION: Suprascapular nerve.
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teres minor |
ORIGIN: The infraglenoid tubercle and distal third of the caudal border of the scapula. INSERTION: The teres minor tuberosity of the humerus. ACTION: To flex the shoulder, rotate the shoul- der laterally, and prevent medial rotation when bearing weight. INNERVATION: Axillary nerve. |
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supraspinatus |
ORIGIN: The supraspinous fossa. INSERTION: The greater tubercle of the humer- us, by a thick tendon. ACTION: To extend and stabilize the shoulder joint. INNERVATION: Suprascapular nerve. |
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subscapularis |
ORIGIN: The subscapular fossa. ACTION: To adduct, extend, and medially stabilize the shoulder joint. To rotate the shoulder medially and prevent lateral rotation when bear- ing weight. INNERVATION: Subscapular nerve. Consider- able support is provided to the shoulder joint by the subscapularis muscle medially, the teres minor and infraspinatus muscles laterally, and the supra- spinatus cranially. Luxation will not occur without injury to the joint capsule and its glenohumeral ligaments (Fig. 2-29). |
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teres major |
ORIGIN: The caudal angle and adjacent caudal border of the scapula; the caudal surface of the subscapularis. INSERTION: The teres major tuberosity of the humerus. ACTION: Flex the shoulder, rotate the shoulder medially, and prevent lateral rotation when weight bearing. INNERVATION: Axillary nerve. |
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coracobrachialis |
ORIGIN: The coracoid process of the scapula. INSERTION: The crest of the lesser tubercle of the humerus proximal to the teres major tuberosity. ACTION: To adduct, extend, and stabilize the shoulder joint. INNERVATION: Musculocutaneous nerve. |
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tensor fasciae antebrachii |
ORIGIN: The fascia covering the lateral side of the latissimus dorsi. INSERTION: The olecranon. ACTION: To extend the elbow. INNERVATION: Radial nerve. |
