: Primarily composed of the pectoralis major and pectoralis minor muscles.
The cavity is filled with fat and connective tissue, which cushions several major structures: axillary cavity
: Formed by the subscapularis , teres major , and latissimus dorsi muscles. : Primarily composed of the pectoralis major and
: Consists of the serratus anterior muscle and the first four or five ribs. : The narrowest part, formed by the intertubercular
: The narrowest part, formed by the intertubercular sulcus (bicipital groove) of the humerus. Core Contents
The axilla is defined by several muscular and skeletal landmarks that shift shape with shoulder movement:
The , commonly referred to as the axilla or "armpit," is a four-sided pyramidal space located at the junction of the upper limb and the thorax. It serves as a vital gateway for neurovascular and lymphatic structures traveling between the neck/torso and the upper extremity. Anatomical Boundaries