Quadrangular space
Encyclopedia
The quadrangular space (or quadrilateral space [of Velpeau]) is an axillary space
in the arm. This is a clinically important anatomic space in the arm. In the quadrangular space, the axillary nerve and posterior circumflex humeral artery can be compressed or damaged in the space 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.
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:...
in the arm. This is a clinically important anatomic space in the arm. In the quadrangular space, the axillary nerve and posterior circumflex humeral artery can be compressed or damaged in the space 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.
Boundaries
It is bounded by:- above/superior: the Subscapularis and Teres minor. Some sources exclude the Teres minor.
- below/inferior: the Teres major
- medially: the long head of the Triceps brachii
- laterally: the surgical neck of the humerusSurgical neck of the humerusThe surgical neck of the humerus is a constriction below the tubercles of the greater tubercle and lesser tubercle.It is much more frequently fractured than the anatomical neck of the humerus. A fracture in this area is most likely to cause damage to the axillary nerve...
