Anterior view of the bones and muscle attachments of the axilla and pectoral region.

Posterior view of the superficial muscles of the back; trapezius muscle is reflected on the left.

Superficial muscles of the back.

Posterior view of the intermediate muscles of the back; trapezius and latissimus dorsi muscles are cut away on both sides.

Coronal MRI of the shoulder; A, acromion; C, clavicle; GT, greater tubercle; H, head of humerus; TR, trapezius; SP, supraspinatus; SV, suprascapular vessels/nerve; GF, glenoid fossa; S, scapula; SB, subscapularis; TM, teres minor, LB, long head of biceps

Trapezius muscle