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Sternocleidomastoid muscle

Sternocleidomastoid
Sternocleidomastoideus.png
Neck muscles, with the sternocleidomastoid shaded.
Woman in white top looking to her left 22March2009.jpg
The right sternocleidomastoid can be clearly observed when rotating the head.
Details
Origin Manubrium and medial portion of the clavicle
Insertion Mastoid process of the temporal bone, superior nuchal line
Artery Occipital artery and the superior thyroid artery
Nerve Motor: accessory nerve
sensory: cervical plexus
Actions

Unilaterally: contralateral cervical rotation, ipsilateral cervical flexion

Bilaterally: cervical flexion, elevation of sternum and assists in forced inhalation.
Identifiers
Latin Musculus sternocleidomastoideus
Dorlands
/Elsevier
m_22/12550942
TA A04.2.01.008
FMA 13407
Anatomical terms of muscle
[]

Unilaterally: contralateral cervical rotation, ipsilateral cervical flexion

In human anatomy, the sternocleidomastoid muscle (/ˌstɜːrnˌkldəˈmæsˌtɔɪd, -nə-, -d-/), also known as sternomastoid and commonly abbreviated as SCM, is a paired muscle in the superficial layers of the side of the neck. It is one of the largest and most superficial cervical muscles. The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. The sternocleidomastoid is innervated by the accessory nerve.

It is given the name sternocleidomastoid because it originates at the manubrium of the sternum (sterno-) and the clavicle (cleido-), and has an insertion at the mastoid process of the temporal bone of the skull.


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Wikipedia

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