Cavity: Axillary
: The narrowest part, formed by the intertubercular sulcus (bicipital groove) of the humerus. Core Contents
: Formed by the axillary fascia and the skin of the armpit. axillary cavity
: Consists of the serratus anterior muscle and the first four or five ribs. : The narrowest part, formed by the intertubercular
: Primarily composed of the pectoralis major and pectoralis minor muscles. : Primarily composed of the pectoralis major and
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
The cavity is filled with fat and connective tissue, which cushions several major structures:
The axilla is defined by several muscular and skeletal landmarks that shift shape with shoulder movement:
