During our routine dissection studies, we encountered a case with abnormal muscle deep to the sternocleidomastoid muscle. According to its origin, insertion and innervation features, the abnormal muscle was considered as cleidooccipitalis muscle.
8. Goss CM (1973) Anatomy of the human body. Lea & Febiger, Philadelphia, pp. 372–396.
9. Kent GC (1987) Comparative anatomy of the vertebrates. Wm. C. Brown Publishers, Dubuque, pp. 352–369.
10. Kocak G, Aysun S, Akhan O (1995) Unilateral agenesis of the sternocleidomastoid muscle. Turk J Pediatr, 37: 435–438.
11. Koizumi M, Horiguchi M, Sekiya S, Isogai S, Nakano M (1993) A case of the human sternocleidomastoid muscle additionally innervated by the hypoglossal nerve. Okajimas Folia Anat Jpn, 69: 361–367.
12. Leon X, Maranillo E, Quer M, Sanudo JR (1995) Case report: cleidocervical or levator claviculae muscle. A new embryological explanation as to its origin. J Anat, 187: 503–504.
13. O’Sullivan ST, Kay SP (1998) An unusual variant of the levator claviculae muscle encountered in exploration of the brachial plexus. J Hand Surg Br, 23: 134–135.
14. Rahman HA, Yamadori T (1994) An anomalous cleidooccipitalis muscle. Acta Anat, 150: 156–158.
15. Rubinstein D, Escott EJ, Hendrick LL (1999) The prevalence and CT appearance of the levator claviculae muscle: a normal variant not to be mistaken for an abnormality. Am J Neuroradiol, 20: 583–586.
16. Sarikcioglu L, Sindel M (2001) A case with subclavius posticus muscle. Folia Morphol, 60: 229–231.