term1 Definition1term2 Definition2term3 Definition3
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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.
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.
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.
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.
subscapularis
ORIGIN: The subscapular fossa.INSERTION: The lesser tubercle of the humerus.
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).
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.
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.
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.
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