Axillary space

The axillary space is an anatomic space, bounded by teres major muscle, teres minor muscle and humerus. Furthermore, it is split into two parts, the lateral and medial, by the long head of triceps brachii muscle.

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

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