title: Subclavius posticus muscle: supernumerary muscle as a potential cause for thoracic outlet syndrome.
abstract: 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.
authors.affiliation: Department of Morphological Sciences, University of Barcelona, Barcelona, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Forcada
authors.forename: M
authors.initials: M
authors.lastname: Rodríguez-Niedenführ
authors.forename: M
authors.initials: M
authors.lastname: Llusá
authors.forename: A
authors.initials: A
authors.lastname: Carrera
mesh_terms: 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