Quadrangular Space
Lateral border of the.
Quadrangular space. Long head of triceps. 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. The axillary nerve and the posterior humeral circumflex artery pass through this space from anterior to posterior.
Quadrangular space syndrome qss aka quadrilateral space syndrome is caused by compression of the axillary nerve and or the posterior circumflex humeral artery in the quadrangular space by fibrous band s with or without surrounding muscle hypertrophy or rarely dilated veins. Lateral to triangular space and medial to triangular interval. Inferior teres major.
Thus the phca could not pass through its usual topographical site the quadrangular space foramen humerotricipitale but after leaving the trunk it coursed underneath the fused tendons of the proximal teres major and distal latisssimus dorsi. Medial long head of triceps brachii. Axillary nerve c5 nerve root posterior cord posterior circumflex humeral artery.
Quadrangular space syndrome also known as quadrilateral space syndrome is an uncommon diagnosis mainly because of lack of literature on the subject and possible misdiagnosis. Superior subscapularis and teres minor. The quadrangular space is an intermuscular space through which the axillary nerve and posterior circumflex humeral vessels pass through backwards to encircle the surgical neck of the humerus.
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. The quadrangular space also known as the quadrilateral space is an anatomic interval formed by the shaft of the humerus laterally the long head of the triceps medially the teres minor muscle superiorly and the teres major muscle inferiorly. The other two spaces are the quadrangular space and the triangular interval.
The triangular space also known as the medial triangular space upper triangular space medial axillary space or foramen omotricipitale is one of the three spaces found at the axillary space. It is bounded above by subscapularis and teres minor and below by teres major. Gross anatomy boundaries medial.