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Deltoideous parts (2)
scapular, acromial
Deltoideous
Origin: the spine and acromial process of the scapula
Insertion: deltoid tuberosity
Action: flex the shoulder joint
Innervation: axillary nerve
Infraspinatus
Origin: infraspinatus fossa
Insertion:small circumscribed area on the lateral side of the greater tubercle of the humerus
Action:prevent medial rotation when weight bearing and provide lateral stability to the shoulder joint
Innervation:suprascapular nerve
Teres minor
Origin: infraglenoid tubercle and distal third of the caudal border of the scapula
Insertion: teres minor tuberosity of the humerus
Action: to flex shoulder joint, rotate the shoulder laterally and prevent medial roation when bearing weight
Supraspinatus
Origin: supraspinous fossa
Insertion: greater tubercle of the humerus, by a thick tendon
Action: to extend and laterally stabilize the shoulder joint
Innervation: suprascapular nerve
Subscapularis
Origin: 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 pervent lateral rotation when bearing weight
Innervation:subscapular nerve
Teres major
Origin: caudal angle and adjacent caudal border of the scapula; caudal surface of the subscapularis
Insertion: teres major tuberosity of the humerus
Action: flex the shoulder, rotate the shoulder medially, and prevent lateral roation when weight bearing
Coracobrachialis
Origin: coracoid process of the scapula
Insertion: crest of the lesser rubercle of the humerus proximal to the teres major tuberosity
Action: adduct, extend, and stabilize the shoulder joint
Innervation: musculocutaneous nerve
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