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Bilateral Supernumerary Sternocleidomastoid Heads With Critical Narrowing Of The Minor And Major Supraclavicular Fossae: Clinical And Surgical Implications, Athanasios Raikos, George Paraskevas, Stefanos Triaridis, Panagiota Kordali, George Psillas, Beate Brand-Saberi

Athanasios Raikos

Extract: Anatomical variations of the sternocleidomastoid muscle are rare and concern its origin, insertion, and the number of heads. We report on a rare bilateral variant of the sternocleidomastoid muscle with aberrant and supernumerary muscular heads, observed in a cadaveric subject. On the right side of the neck, a typical sternomastoid head of the sternocleidomastoid muscle, and three aberrant clavicular heads of variable thickness, origin, and termination were noticed. On the left side, two sternomastoid heads were present; the medial one was of typical pattern, while the lateral was supernumerary. The cleidomastoid portion of the left sternocleidomastoid muscle was fused …