title: Bilateral four heads of the sternocleidomastoid muscle.
abstract: The sternocleidomastoid muscle shows a wide range of variations including supernumerary muscular heads. We found a rare variation in the sternocleidomastoid muscle with bilateral supernumerary heads in a 67-year-old Korean male cadaver. Bilateral four muscle bellies were recorded: two sternomastoids, one cleido-occipital and one cleido-mastoid occipital on the right side, and one sternomastoid, one cleido-occipital and two cleido-mastoids on the left side. The variation of bilateral four heads on sternocleidomastoid muscle is important to surgeons and anesthetists for clinical using.
authors.affiliation: Medical Course, School of Medicine, Jeju National University, Jeju, Jeju, Republic of Korea.
authors.forename: So-Yeon
authors.initials: SY
authors.lastname: Kim
authors.forename: Han-Bin
authors.initials: HB
authors.lastname: Jang
authors.forename: Jinu
authors.initials: J
authors.lastname: Kim
authors.forename: Sang Pil
authors.initials: SP
authors.lastname: Yoon
mesh_terms: D000368:Aged; D002102:Cadaver; D004210:Dissection / Q000379:methods; D006801:Humans; D008297:Male; D009139:Musculoskeletal Abnormalities / Q000175:diagnosis*; D009334:Neck Muscles / Q000002:abnormalities*; D035583:Rare Diseases; D056910:Republic of Korea