Cavity — Axillary

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

: Primarily composed of the pectoralis major and pectoralis minor muscles.

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

Anatomy, Shoulder and Upper Limb, Axilla - StatPearls - NCBI

: Consists of the serratus anterior muscle and the first four or five ribs. The cavity is filled with fat and connective

: 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: Anatomical Boundaries Anatomy

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