Table of Muscles

*MUSCLE*	*ORIGIN*	*INSERTION*	*ACTION*	*INNERVATION*
trapezius	superior nuchal line of occipital bone nuchal ligament spines of 7th & all thoracic vertebrae	lateral third of clavicle median margin of acromion scapular spine	elevates shoulder laterally rotates scapula retracts scapula on thoracic wall	spinal accessory n.
latissimus dorsi	spinous processes of lower thoracic vertebrae lumbodorsal fascia crest of ilium	floor of intertubercular groove of humerus	adducts, extends, medially rotates arm	thoracodorsal n.
rhomboid major	spinous processes of 2nd thru 5th thoracic vertebrae	medial border of scapula below root of scapular spine	retracts and medially rotates scapula	dorsal scapular n.
rhomboid minor	spine of 7th cervical and 1st thoracic vertebrae lower part of nuchal ligament	medial margin of scapula at the root of the scapular spine	retracts and medially rotates scapula	dorsal scapular n.
levator scapulae	transverse processes of C1-C4	medial border of scapula above root of scapular spine	raises scapula	dorsal scapular n.
supraspinous	supraspinous fossa of scapula	superior aspect of greater tubercle of humerus	abducts the arm (1st 15 degrees)	suprascapular n.
infraspinous	infraspinous fossa of scapula	mid portion of greater tubercle of humerus	rotates the arm laterally	suprascapular n.
teres minor	lateral border of scapula	lower aspect of greater tubercle of humerus	rotates arm laterally	axillary n.
teres major	inferior medial border of scapula	crest of lesser tubercle of humerus	adducts and rotates arm medially	lower subscapular n.
deltoid	lateral third of clavicle acromion process scapular spine	deltoid tuberosity of humerus	abduction of arm from 15 degrees to 90 degrees	axillary n.
triceps, long head	infraglenoid tubercle of scapula	olecranon process of ulna	extends arm and forearm	radial n.

Vessels & Nerves of Posterior Shoulder Structures

Surface Anatomy of Pectoral Region

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