An Anomalous Cleido-Occipitalis Muscle

Rahman, Hanie A.; Yamadori, Takashi

doi:10.1159/000313645

Cited by 15 publications

(12 citation statements)

References 2 publications

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“…The reported incidence of the cleidooccipital muscle ranges from 4.16% to 36.3% (Sarikcioglu et al, 2001;Wood, 1869). The muscle can be also found bilaterally (Rahman & Yamadori, 1994).…”

Section: Discussionmentioning

confidence: 99%

Bilateral Supernumerary Sternocleidomastoid Heads with Critical Narrowing of the Minor and Major Supraclavicular Fossae: Clinical and Surgical Implications

et al. 2012

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RAIKOS, A.; PARASKEVAS, G. K.; TRIARIDIS, S.; KORDALI, P.; PSILLAS, G. & BRAND-SABERI, B.Bilateral supernumerary sternocleidomastoid heads with critical narrowing of the minor and major supraclavicular fossae: clinical and surgical implications. Int. J. Morphol., 30(3):927-933, 2012. SUMMARY: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 with the double sternomastoid segment. A strap-like muscle originating from the middle third of the clavicle and inserting onto the transverse process of the C3 vertebra was noticed. This is known as the cleidocervical muscle. On the right side of the neck, the posterior cervical triangle was diminished, the minor supraclavicular fossa was considerably narrow, whereas on the left, it was diminished in addition to a bilateral shortening of the major supraclavicular fossa minimizing space needed for potential surgical access. These findings are of prominent significance for anesthetists in ultrasound guided needle positioning in brachial plexus block, as well as in subclavian or external jugular vein catheterization, and in surgical interventions involving structures lying under the sternocleidomastoid muscle.

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“…The reported incidence of the cleidooccipital muscle ranges from 4.16% to 36.3% (Sarikcioglu et al, 2001;Wood, 1869). The muscle can be also found bilaterally (Rahman & Yamadori, 1994).…”

Section: Discussionmentioning

confidence: 99%

Bilateral Supernumerary Sternocleidomastoid Heads with Critical Narrowing of the Minor and Major Supraclavicular Fossae: Clinical and Surgical Implications

et al. 2012

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“…In the region of the posterior triangle of the neck the unusual cleido-occipitalis muscle may be present in peculiar variants (Rahman and Yamadori, 1994;Kwak et al, 2003). Kwak et al (2003) reported a case of cleido-occipitalis forming a flat tendinous arch over the clavicle.…”

Section: Variant Muscular Structuresmentioning

confidence: 99%

Study of variant anatomical structures (bony canals, fibrous bands, and muscles) in relation to potential supraclavicular nerve entrapment

Jelev

Surchev

2006

Clinical Anatomy

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Since the definition of supraclavicular nerve entrapment syndrome by Gelberman et al. (Gelberman et al. [1975] J. Bone Joint Surg. Am. 57:119) a number of clinical cases of this specific entrapment neuropathy have been reported. In all these cases, the nerve injury has been attributed to the location of the supraclavicular nerve branch in a narrow canal in the clavicle. However, in the anatomical literature, variations in the course of the supraclavicular nerves have not only been ascribed to bony canals but also to abnormal fibrous and muscular structures. Considering the fact that the existence of a narrow site with rigid walls along the course of a nerve is essential for the development of an entrapment neuropathy, our study examines all the variant anatomical structures with a possible role in supraclavicular nerve entrapment. We describe three groups of anatomical structures with close relation to the course of the supraclavicular nerves-transclavicular canals, fibrous bands, and unusual muscular structures. Based on the characteristics of the variations found, for the first time, we suggest that in addition to the bony canals through the clavicle certain fibrous and muscular structures could also be an anatomical basis for supraclavicular nerve entrapment syndrome.

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“…The cleido-occipitalis cervicalis muscle is an isolated bundle between the trapezius and sternocleidomastoid muscles that appears to arise as a segregation of the common primordium of those muscles (Rahman and Yamadori 1994;Kwak et al 2003; Source: Mori (1964). Source: Mori (1964).…”

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confidence: 99%