A 2 headed muscle that lies on the upper arm between the shoulder and the elbow.
Pectoralis major, is a thick fan-shaped muscle situated at the chest (anterior) of the human body. It makes up the bulk of the chest muscles in the male and lies under the breast in the female.
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A 3 headed arm muscle, it is a large muscle on the back of the upper limb responsible for the straightening of the arm.
The human shoulders are made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone).
Latissimus dorsi, or lats, is the largest broadest muscle of the back.
Traps / Rear delts / Forearms
The trapezius has three functional regions: the superior region (descending part), which supports the weight of the arm; the intermediate region (transverse part), which retracts the scapulae; and the inferior region (ascending part), which medially rotates and depresses the scapulae.