1. Accessory subscapularis muscle - A forgotten variation?
- Author
-
Pires LAS, Souza CFC, Teixeira AR, Leite TFO, Babinski MA, and Chagas CAA
- Subjects
- Axillary Artery anatomy & histology, Cadaver, Humans, Male, Muscle, Skeletal blood supply, Muscle, Skeletal innervation, Shoulder Joint blood supply, Shoulder Joint innervation, Anatomic Variation, Brachial Plexus anatomy & histology, Muscle, Skeletal abnormalities, Nerve Compression Syndromes etiology, Shoulder Joint abnormalities
- Abstract
The quadrangular space is a space in the axilla bounded by the inferior margin of the teres minor muscle, the superior margin of the teres major muscle, the lateral margin of the long head of the triceps brachii muscle and the surgical neck of the humerus, medially. The axillary nerve (C5-C6) and the posterior circumflex humeral artery and veins pass through this space in order to supply their territories. The subscapularis muscle is situated into the scapular fossa and inserts itself into the lesser tubercle of the humerus, thus helping stabilize the shoulder joint. A supernumerary muscle known as accessory subscapularis muscle originates from the anterior surface of the muscle and usually inserts itself into the shoulder joint. It is a rare variation with few reports of its existence and incidence. We present a case of the accessory subscapularis muscle in a male cadaver fixated with a 10% formalin solution. The muscle passed anteriorly to the axillary nerve, thus, predisposing an individual to quadrangular space compression syndrome. We perform a review of the literature and address its clinical, anthropological and anatomical significance., (Copyright © 2017 Elsevier Masson SAS. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF