Sternocleidomastoid

Introduction

Neck muscle

Also called sternomastoid

Paired : left and right

Origin and insertion

Orginates from manubrium of the sternum and clavicle by two heads - sternal and clavicular heads

Inserted into the mastoid process of the temporal bone of the skull

Blood supply

Artery : Occipital artery and the superior thyroid artery

Nerve supply

Motor : accessory nerve

Sensory : cervical plexus

Action

Acting alone, tilts head to its own side and rotates it so the face is turned towards the opposite side.

Acting together, flexes the neck, raises the sternum and assists in forced inspiration

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