Axillary Cavity 99%

: Formed by the subscapularis , teres major , and latissimus dorsi muscles.

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

: Formed by the axillary fascia and the skin of the armpit. : Formed by the subscapularis , teres major

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 : Formed by the subscapularis

: 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.