Quadrangular space


The quadrangular space is one of the three spaces in the axillary space. The other two spaces are: triangular space and triangular interval.

Boundaries

The quadrangular space is defined by:
It transmits the axillary nerve and posterior circumflex humeral vessels.

Clinical significance

Quadrangular space is a clinically important anatomic space in the arm as it provides the anterior regions of the axilla a passageway to the posterior regions. In the quadrangular space, the axillary nerve and posterior circumflex humeral artery can be compressed or damaged due to space-occupying lesions or disruption in the anatomy due to trauma. Symptoms include axillary nerve related weakness of the deltoid muscle in the case of any significant mass lesions in the quadrangular space.

Additional images