Muscles of the shoulder and pectoral girdle

Deltoid

Insertion:

Action:

Insertion: deltoid tuberosity of the humerus

Action: Abduction of the GH joint

Serratus Anterior

Nerve:

Nerve: long thoracic nerve

Subclavius

Nerve:

Nerve: Subclavian

Teres Major

Action:

Action: extend, adduct and internally rotate the GH joint

Trapezius 

Action of lower fibers:

Action of lower fibers: depress the scapula, upward rotation of the scapula

Rotator Cuff

S

I

T

S

S - supraspinatus

I - infraspinatus

T - teres minor

S - subscapularis

Supraspinatus

Nerve:

Nerve: Suprascapular nerve

Infraspinatus

Action:

Action: abduct the GH joint, stabilize the head of the humerus in the glenoid fossa, external rotation of the GH joint