Quadrilateral Space
The top of the quadrilateral is bordered by a muscle called the teres minor.
Quadrilateral space. The other two spaces are. A quadrilateral is a four sided shape. An anatomic space in the upper arm and shoulder which is defined superiorly by the teres minor anteriorly by the subscapularis inferiorly by the teres major and latissimus dorsi medially by the long head of the triceps and laterally by the proximal humerus.
Three of the sides of the quadrilateral space are formed by muscles. Lateral border of the long head of the triceps brachii muscle. Triangular space and triangular interval.
The quadrilateral space is located posterior and inferior to the glenohumeral joint and contains the axillary nerve and posterior humeral circumflex artery. 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 space contains the axillary nerve which lies in close proximity to the inferior shoulder joint capsule and exits posteriorly around the humeral neck.
The quadrilateral space of the shoulder is in the upper back where the shoulder meets the body. The quadrilateral space is located posterior and inferior to the glenohumeral joint and contains the axillary nerve and posterior humeral circumflex artery. Medial cortex of the surgical neck of humerus.