Subclavius posticus muscle: supernumerary muscle as a potential cause for thoracic outlet syndrome.
During routine dissection a subclavius posticus muscle was found on the left side of a male cadaver. This muscle arose from the upper margin of the scapula and transverse scapular ligament, inserted in the superior side of the first rib cartilage, and was innervated by a small branch from the suprascapular nerve. The anatomical relationships of the supernumerary muscle with the brachial plexus and the subclavian artery is suggestive of a possible cause of the thoracic outlet syndrome and therefore of clinical significance.
Forcada
P
P
Department of Morphological Sciences, University of Barcelona, Barcelona, Spain.
Rodríguez-Niedenführ
M
M
Llusá
M
M
Carrera
A
A
D001917:Brachial Plexus / Q000473:pathology*; D002102:Cadaver; D006801:Humans; D018482:Muscle, Skeletal / Q000002:abnormalities*; D009333:Neck / Q000033:anatomy & histology; D013348:Subclavian Artery / Q000473:pathology*; D013901:Thoracic Outlet Syndrome / Q000209:etiology* / Q000473:pathology