The cavity is filled with fat and connective tissue, which cushions several major structures:
: Formed by the axillary fascia and the skin of the armpit. axillary cavity
: Primarily composed of the pectoralis major and pectoralis minor muscles. The cavity is filled with fat and connective
: The narrowest part, formed by the intertubercular sulcus (bicipital groove) of the humerus. Core Contents formed by the first rib
The axilla is defined by several muscular and skeletal landmarks that shift shape with shoulder movement:
: The top of the pyramid, formed by the first rib , the scapula , and the clavicle . It connects the axilla to the posterior triangle of the neck.