Sternocleidomastoid muscle

Sternocleidomastoid
Sternocleidomastoid
	Neck muscles, with the sternocleidomastoid in bright red
	The sternocleidomastoid (right muscle shown) can be clearly observed when rotating the head.
Details
Pronunciation	(/ˌstɜːrnoʊˌklaɪdəˈmæsˌtɔɪd, -nə-, -doʊ-/)
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: spinal accessory nerve; sensory: cervical plexus; Proprioceptive: ventral rami of C2-3
Actions	Unilaterally: contralateral cervical rotation, ipsilateral cervical flexion Bilaterally: cervical flexion, elevation of sternum and assists in forced inhalation.
Identifiers
Latin	musculus sternocleidomastoideus
TA98	A04.2.01.008
TA2	2156
FMA	13407
	Anatomical terms of muscle

The sternocleidomastoid muscle 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.

^ "Sternocleidomastoid". Merriam-Webster.com Dictionary. Retrieved 2016-01-21.
^ "Sternocleidomastoid". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2020-03-22.

[1] "Sternocleidomastoid". Merriam-Webster.com Dictionary. Retrieved 2016-01-21.

[2] "Sternocleidomastoid". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2020-03-22.

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