Quadrangular space

The quadrangular space is a location in the arm which is bounded by:


 * above/superior: the Subscapularis and Teres minor (inferior border)
 * below/inferior: the Teres major (superior border)
 * medially: the long head of the Triceps brachii
 * laterally: the surgical neck of the humerus

It transmits the axillary nerve and posterior humeral circumflex artery.