Quadrilateral Space

The quadrangular space or quadrilateral space of velpeau or foramen humerotricipitale is one of the three spaces in the axillary space.
Quadrilateral space. The space is bounded superiorly by the teres minor muscle inferiorly by the teres major muscle medially by the long head of the triceps and laterally by the humeral shaft. The other two spaces are. Quadrilateral space syndrome is a rare disorder characterized by compression of the axillary nerve and posterior humeral circumflex artery within the quadrilateral space 1. The quadrilateral space is located posterior and inferior to the glenohumeral joint and contains the axillary nerve and posterior humeral circumflex artery.
A quadrilateral is a four sided shape. The space contains the axillary nerve which lies in close proximity to the inferior shoulder joint capsule and exits posteriorly around the humeral neck. Medial cortex of the surgical neck of humerus. The quadrilateral space is located posterior and inferior to the glenohumeral joint and contains the axillary nerve and posterior humeral circumflex artery.
Triangular space and triangular interval. Lateral border of the long head of the triceps brachii muscle. The quadrilateral space of the shoulder is in the upper back where the shoulder meets the body. The quadrangular space or quadrilateral space is one of three spaces located in the posterior compartment of the arm along with the lateral triangular space and medial triangular space.