Cavity - Axillary

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

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

: The narrowest part, formed by the intertubercular sulcus (bicipital groove) of the humerus. Core Contents : Primarily composed of the pectoralis major and

: Formed by the axillary fascia and the skin of the armpit. Shoulder and Upper Limb