Bilateral supernumerary sternocleidomastoid heads with critical narrowing of the minor and major supraclavicular fossae: Clinical and surgical implications

Athanasios Raikos, George K. Paraskevas, Stefanos Triaridis, Panagiota Kordali, George Psillas, Beate Brand-Saberi

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

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.

Translated title of the contributionBilateral supernumerary sternocleidomastoid heads with critical narrowing of the minor and major supraclavicular fossae: Clinical and surgical implications
Original languageSpanish
Pages (from-to)927-933
Number of pages7
JournalInternational Journal of Morphology
Volume30
Issue number3
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

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Head
Muscles
Neck
Clavicle
Jugular Veins
Catheterization
Needles
Spine

Cite this

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title = "Cabezas Supernumerarias Bilaterales del M{\'u}sculo Esternocleidomasto{\'i}deo con Estrechamiento Cr{\'i}tico de las Fosas Supraclavicular Menor y Mayor: Implicancias Cl{\'i}nicas y Quir{\'u}rgicas",
abstract = "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.",
author = "Athanasios Raikos and Paraskevas, {George K.} and Stefanos Triaridis and Panagiota Kordali and George Psillas and Beate Brand-Saberi",
year = "2012",
month = "9",
doi = "10.4067/S0717-95022012000300027",
language = "Spanish",
volume = "30",
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journal = "International Journal of Morphology",
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Cabezas Supernumerarias Bilaterales del Músculo Esternocleidomastoídeo con Estrechamiento Crítico de las Fosas Supraclavicular Menor y Mayor : Implicancias Clínicas y Quirúrgicas. / Raikos, Athanasios; Paraskevas, George K.; Triaridis, Stefanos; Kordali, Panagiota; Psillas, George; Brand-Saberi, Beate.

In: International Journal of Morphology, Vol. 30, No. 3, 09.2012, p. 927-933.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Cabezas Supernumerarias Bilaterales del Músculo Esternocleidomastoídeo con Estrechamiento Crítico de las Fosas Supraclavicular Menor y Mayor

T2 - Implicancias Clínicas y Quirúrgicas

AU - Raikos, Athanasios

AU - Paraskevas, George K.

AU - Triaridis, Stefanos

AU - Kordali, Panagiota

AU - Psillas, George

AU - Brand-Saberi, Beate

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AB - 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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