MORPHOLOGICAL VARIANT OF STERNOCLEIDOMASTOID MUSCLE
A CASE REPORT
Keywords:
sternocleidomastoid , unilateral, accessory bellyAbstract
The sternocleidomastoid is an important muscle of head and neck region dividing the neck into anterior and posterior triangles. It arises from two heads one sternal and other clavicular and gets inserted into the lateral surface of mastoid process and lateral part of superior nuchal line.
Unilateral variation found in origin of sternocleidomastoid muscle during routine dissection of head and neck region on a 60 year old male cadaver. Three heads of sternocleidomastoid were found on the left side.
The accessory head of sternocleidomastoid muscle was found on the left side taking origin from clavicle 4.2cm lateral to the normal clavicular head. Its fibres then merged with the normal clavicular fibers and got inserted into the lateral surface of mastoid process and lateral part of superior nuchal line.
The study will help the surgeons and interventionists for muscle graft and also approach of this area carefully during neck surgery or while taking MRI scans.
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