Axillary space

Axillary space
Axillary space, between the teres major and teres minor muscles, and split into a medial and lateral part by the triceps brachii muscle.
Details
Latin	spatium axillare
Anatomical terminology []

The axillary space is an anatomic space, bounded by teres major muscle, teres minor muscle and humerus. It is split into two parts by the long head of the triceps brachii into a lateral quadrangular and a medial triangular part. The lateral part is known as the quadrangular space and the medial, the triangular space.

This space is quadrangular, and therefore also called the quadrangular space. The axillary nerve, posterior humeral circumflex artery and posterior humeral circumflex vein pass through it.

This space is triangular, and is therefore also called the triangular space. The scapular circumflex artery and scapular circumflex vein pass through it.