Axillary Cavity Apr 2026

: 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.

The cavity is filled with fat and connective tissue, which cushions several major structures:

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 axillary cavity

: Formed by the axillary fascia and the skin of the armpit.

The axilla is defined by several muscular and skeletal landmarks that shift shape with shoulder movement: : The top of the pyramid, formed by

: The narrowest part, formed by the intertubercular sulcus (bicipital groove) of the humerus. Core Contents

: Primarily composed of the pectoralis major and pectoralis minor muscles. It serves as a vital gateway for neurovascular

: Consists of the serratus anterior muscle and the first four or five ribs.