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9 terms

Muscles that Move the Arm

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Coracobrachialis
Origin: coracoid process of scapula
Insertion: medial surface of humerus near mid-point
Action: stabilizes shoulder joint
Pectoralis major
O: medial c3
I: lateral lip of bicipital groove of the humerus
A: shoulder flexion 60 degrees
Teres major
O: posterior aspect of the inferior angle of scapula
I: medial lip of humerus
A: internal rotation of humerus
Teres minor
O: axillary border of scapula
I: greater tubercle of humerus
A: lateral shoulder rotation, horizontal abduction
Latissimus dorsi
O: spinous process of t7-l5, posterior surface of sacrum
I: medial lip or bicipital groove of humerus
A: shoulder extension, adduction, medial rotation, hyperextension
Supraspinatus
O: supraspinous fossa of scapula
I: greater tubercle of humerus
A: shoulder abduction
Deltoid
O: spine of scapula
I: deltoid tuberosity
A: shoulder abduction, extension, hyperextension, lateral rotation, horizontal abduction
Subscapularis
O: subscapular fossa
I: lesser tubercle of humerus
A: rotates humerus medially, stabilizes shoulder
infraspinatus
O: infraspinous fossa of scapula
I: greater tubercle of humerus
A: lateral shoulder rotation, horizontal abduction