: 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:
The cavity is filled with fat and connective tissue, which cushions several major structures: axillary cavity
: Formed by the axillary fascia and the skin of the armpit.
: Formed by the subscapularis , teres major , and latissimus dorsi muscles. : The narrowest part, formed by the intertubercular
: Primarily composed of the pectoralis major and pectoralis minor muscles.
Anatomy, Shoulder and Upper Limb, Axilla - StatPearls - NCBI : The narrowest part
: Consists of the serratus anterior muscle and the first four or five ribs.