Zafer Kutay COŞKUN, Yadigar KASTAMONİ YAŞAR, Afitap ANIL, Tuncay PEKER, Feza ANIL

Bilateral Çok Başlı Musculus Sternocleidomastoideus Varyasyonu

Boyunda birçok nörovasküler yapılarla ilişkisi nedeniyle, musculus sternocleidomastoideus (SCM) anatomik ve klinik açıdan önemlidir. Kas, boynun yan tarafı boyunca oblik olarak iner ve boynu ön ve arka üçgenlere böler. Bu vakada, bilateral musculus sternocleidomastoideus’un ek klavikular başı gösterildi. Gazi Üniversitesi Tıp Fakültesi Anatomi Anabilim Dalı Laboratuvarı’nda, anatomi eğitimi için yapılan rutin boyun diseksiyonu sırasında, bilateral olarak musculus sternocleidomastoideus’un ek klavikular başı gözlendi. Ek klavikular başlar clavicula’nın üçte bir orta kısmının üst yüzünden orijin almakta idi. Ayrıca, boynun sol tarafında, SCM’nin sternal başından kaynaklanan ve SCM’nin klavikular başıyla karışan kas lifleri görüldü. Her iki trigonum supraclaviculare minor normalden daha dar gözlendi. Medikal alanda, nadir klinik olaylarda tanı ve tedavi zor hale gelir. Bu zorluğu önlemek için anatomik varyasyonların bilinmesi çok önemlidir.

Variation of Bilateral Multiheaded Sternocleidomastoid Muscle

The sternocleidomastoid muscle is important anatomically and clinicallybecause of its relationship with many neurovascular structures in the neck.The muscle descends obliquely across the side of the neck and divides it intoanterior and posterior triangles. In this case report, the additional clavicularhead of bilateral sternocleidomastoid muscle was shown. During routinedissections of the neck for anatomy education in the Department ofAnatomy Laboratory in the Faculty of Medicine at the Gazi University,additional clavicular heads of sternocleidomastoid muscle were observedbilaterally. The additional clavicular heads originated from the superiorsurface of the middle third of the clavicle. Furthermore, on the left side ofthe neck, muscle fibers originating from sternal head of sternocleidomastoidmuscle and blending with clavicular head of sternocleidomastoid musclewere seen. Both of the minor supraclavicular triangles were narrower thannormal. Unusual clinical cases in medical area makes diagnosis andtreatment more difficult. Knowledge of anatomical variations is veryimportant for avoiding of this difficulty.

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