Sternocleidomastoid muscle

Sternocleidomastoid
Neck muscles, with the sternocleidomastoid in bright red
The sternocleidomastoid (right muscle shown) can be clearly observed when rotating the head.
Details
Pronunciation(/ˌstɜːrnˌkldəˈmæsˌtɔɪd, -nə-, -d-/[1][2])
OriginManubrium and medial portion of the clavicle
InsertionMastoid process of the temporal bone, superior nuchal line
ArteryOccipital artery and the superior thyroid artery
NerveMotor: spinal accessory nerve
sensory: cervical plexus
Proprioceptive: ventral rami of C2-3
ActionsUnilaterally: contralateral cervical rotation, ipsilateral cervical flexion Bilaterally: cervical flexion, elevation of sternum and assists in forced inhalation.
Identifiers
Latinmusculus sternocleidomastoideus
TA98A04.2.01.008
TA22156
FMA13407
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.[3] The sternocleidomastoid is innervated by the accessory nerve.[3]

  1. ^ "Sternocleidomastoid". Merriam-Webster.com Dictionary. Merriam-Webster. Retrieved 2016-01-21.
  2. ^ "Sternocleidomastoid". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2020-03-22.
  3. ^ a b Kohan, Emil J.; Wirth, Garrett A. (2014). "Anatomy of the neck". Clinics in Plastic Surgery. 41 (1): 1–6. doi:10.1016/j.cps.2013.09.016. ISSN 1558-0504. PMID 24295343.