Sternocleiodomastoid muscle with five fleshy bellies and thirteen heads of origin

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Abstract

Sternocleidomastoid (SCM) is the main landmark muscle of the neck. Knowledge of variations of this muscle is very important for radiologist, surgeons, chiropractitioners, plastic surgeons and clinicians in general. We report a unique unilateral variation of SCM observed in an adult male cadaver. The clavicular head of right SCM had four fleshy bellies (B1, B2, B3 and B4). The most medial belly (B1) had three tendons of origin; the next belly just lateral to it (B2) had three tendons of origin; third belly (B4) had four tendons of origin and the lateral most belly (B4) had two tendons of origin. Thus, including the tendon of sternal head, in total, the right SCM had thirteen heads of origin. To the best of our knowledge, this is the first report on a thirteen headed sternocleidomastoid muscle. We review the literature and discuss the clinical importance of the variation in this report.

Original languageEnglish
Article number11
JournalOnline Journal of Health and Allied Sciences
Volume15
Issue number3
Publication statusPublished - 01-01-2016

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Tendons
Head
Muscles
Neck Muscles
Cadaver
Surgeons

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

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title = "Sternocleiodomastoid muscle with five fleshy bellies and thirteen heads of origin",
abstract = "Sternocleidomastoid (SCM) is the main landmark muscle of the neck. Knowledge of variations of this muscle is very important for radiologist, surgeons, chiropractitioners, plastic surgeons and clinicians in general. We report a unique unilateral variation of SCM observed in an adult male cadaver. The clavicular head of right SCM had four fleshy bellies (B1, B2, B3 and B4). The most medial belly (B1) had three tendons of origin; the next belly just lateral to it (B2) had three tendons of origin; third belly (B4) had four tendons of origin and the lateral most belly (B4) had two tendons of origin. Thus, including the tendon of sternal head, in total, the right SCM had thirteen heads of origin. To the best of our knowledge, this is the first report on a thirteen headed sternocleidomastoid muscle. We review the literature and discuss the clinical importance of the variation in this report.",
author = "Sudarshan Surendran and Nayak, {Satheesha B.} and Deepthinath Reghunathan and {Nelluri Melaka}, {Venu Madhav}",
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AU - Surendran, Sudarshan

AU - Nayak, Satheesha B.

AU - Reghunathan, Deepthinath

AU - Nelluri Melaka, Venu Madhav

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Sternocleidomastoid (SCM) is the main landmark muscle of the neck. Knowledge of variations of this muscle is very important for radiologist, surgeons, chiropractitioners, plastic surgeons and clinicians in general. We report a unique unilateral variation of SCM observed in an adult male cadaver. The clavicular head of right SCM had four fleshy bellies (B1, B2, B3 and B4). The most medial belly (B1) had three tendons of origin; the next belly just lateral to it (B2) had three tendons of origin; third belly (B4) had four tendons of origin and the lateral most belly (B4) had two tendons of origin. Thus, including the tendon of sternal head, in total, the right SCM had thirteen heads of origin. To the best of our knowledge, this is the first report on a thirteen headed sternocleidomastoid muscle. We review the literature and discuss the clinical importance of the variation in this report.

AB - Sternocleidomastoid (SCM) is the main landmark muscle of the neck. Knowledge of variations of this muscle is very important for radiologist, surgeons, chiropractitioners, plastic surgeons and clinicians in general. We report a unique unilateral variation of SCM observed in an adult male cadaver. The clavicular head of right SCM had four fleshy bellies (B1, B2, B3 and B4). The most medial belly (B1) had three tendons of origin; the next belly just lateral to it (B2) had three tendons of origin; third belly (B4) had four tendons of origin and the lateral most belly (B4) had two tendons of origin. Thus, including the tendon of sternal head, in total, the right SCM had thirteen heads of origin. To the best of our knowledge, this is the first report on a thirteen headed sternocleidomastoid muscle. We review the literature and discuss the clinical importance of the variation in this report.

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