Undecussated innervation to the sternocleidomastoid muscle: a reinstatement

Ann Neurol. 1980 Jan;7(1):84-5. doi: 10.1002/ana.410070116.


Clinical evidence is presented to support the contention that the sternocleidomastoid muscle is innervated primarily by undecussated fibers from the ipsilateral hemisphere. Stroke patients often show contralateral hemiparesis accompanied by weakness in head turning to the side of the paresis.

MeSH terms

  • Accessory Nerve / anatomy & histology*
  • Accessory Nerve / physiology
  • Cerebrovascular Disorders / physiopathology
  • Dominance, Cerebral / physiology
  • Hemiplegia / physiopathology
  • Humans
  • Movement
  • Muscles / innervation*
  • Neck Muscles / innervation*
  • Neck Muscles / physiopathology