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Sternomastoid Muscle


STRUCTURE AND POSITION 

  •         Sternocleidomastoid is present on anterior side of the Neck superficially.
  •         It is easily visible on rotation of neck to one side and is a cylindrical mescle.
  •         It is a paired muscle and present on both sides of the neck.

ATTACHMENTS 

Sternocleidomastoid has an origin and an insertion as follows :

BLOOD SUPPLY 

Sternocleidomastoid Muscle is supplied via branches of Posterior Auricular, Occipital, Superior Thyroid Artery. It is also supplied by Suprascapular and Superficial Cervical Arteries which are branches of the Subclavian Artery.

NERVE SUPPLY 

Sternocleidomastoid is innervated by the Accessory Nerve, and also by the Ventral Rami of the C2,C3 and C4 spinal nerves.

ACTION 

Sternocleidomastoid Muscle can flex or extend the Head. It also pulls and rotates it to the opposite side. Sternocleidomastoid can also raise the Rib Cage.



STRUCTURE AND POSITION 

  •         Sternocleidomastoid is present on anterior side of the Neck superficially.
  •         It is easily visible on rotation of neck to one side and is a cylindrical mescle.
  •         It is a paired muscle and present on both sides of the neck.

ATTACHMENTS 

Sternocleidomastoid has an origin and an insertion as follows :

BLOOD SUPPLY 

Sternocleidomastoid Muscle is supplied via branches of Posterior Auricular, Occipital, Superior Thyroid Artery. It is also supplied by Suprascapular and Superficial Cervical Arteries which are branches of the Subclavian Artery.

NERVE SUPPLY 

Sternocleidomastoid is innervated by the Accessory Nerve, and also by the Ventral Rami of the C2,C3 and C4 spinal nerves.

ACTION 

Sternocleidomastoid Muscle can flex or extend the Head. It also pulls and rotates it to the opposite side. Sternocleidomastoid can also raise the Rib Cage.

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