title: Accessory coracobrachialis muscle with two bellies and abnormal insertion - case report.
abstract: OBJECTIVE
  In the current study a brief review is presented of the coracobrachialis muscle's morphological variability, action, embryological development and clinical significance.
  
  
  METHODS
  We report a case of a left-sided coracobrachialis muscle consisting of two bellies. The deep belly inserts into the usual site in the middle area of the anteromedial aspect of the left humerus, whereas the superficial belly inserts through a muscular slip into the brachial fascia and the medial intermuscular septum, forming a musculo-aponeurotic tunnel in the middle region of the left arm, for the passage of the median nerve, brachial artery and veins, medial antebrachial cutaneous nerve and ulnar nerve.
  
  
  CONCLUSIONS
  Awareness of such a muscle variant should be kept in mind by physicians and surgeons during interpretation of neural and vascular disorders of the upper limb, since such a variant may potentially lead to entrapment neuropathy and/or vascular compression, predisposing to neurovascular disorders, as well as during preparation of that muscle in cases of utilizing it as a graft in reconstruction of defects.
authors.affiliation: Department of Anatomy, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece. g_paraskevas@yahoo.gr.
authors.forename: George
authors.initials: G
authors.lastname: Paraskevas
authors.affiliation: Department of Anatomy, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Koutsouflianiotis
authors.affiliation: Department of Anatomy, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Kalliopi
authors.initials: K
authors.lastname: Iliou
authors.affiliation: Department of Anatomy, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Theodosis
authors.initials: T
authors.lastname: Bitsis
authors.affiliation: Department of Anatomy, Faculty of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Kitsoulis
mesh_terms: D000368:Aged; D001132:Arm / Q000098:blood supply / Q000294:innervation; D001916:Brachial Artery / Q000033:anatomy & histology*; D002102:Cadaver; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000002:abnormalities* / Q000098:blood supply / Q000294:innervation
keywords: Clinical applications; Coracobrachialis muscle; Variation