The cavity is filled with fat and connective tissue, which cushions several major structures:
: 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.
: Formed by the subscapularis , teres major , and latissimus dorsi muscles. axillary cavity
: Primarily composed of the pectoralis major and pectoralis minor muscles.
: The narrowest part, formed by the intertubercular sulcus (bicipital groove) of the humerus. Core Contents The cavity is filled with fat and connective
Anatomy, Shoulder and Upper Limb, Axilla - StatPearls - NCBI
: Consists of the serratus anterior muscle and the first four or five ribs. : Primarily composed of the pectoralis major and
The axilla is defined by several muscular and skeletal landmarks that shift shape with shoulder movement: