left sternocleidomastoid
Muscular systemNeckLeftFMA13409
Nomenclature
left sternocleidomastoid
musculus sternocleidomastoideus (Latin)
muscolo sternocleidomastoideo sinistro (Italian)
Descriptionentry
Superficial muscle of the neck bounding the cervical triangles.
Functionentry
Flexion and contralateral rotation of the head; accessory muscle of inspiration.
Originentry
Sternal head: manubrium of the sternum; clavicular head: medial third of the clavicle.
Insertionentry
Mastoid process of the temporal bone and superior nuchal line.
Innervationentry
Accessory nerve (XI); C2-C3 for proprioception.
Blood supplyentry
Occipital and superior thyroid arteries.
Clinical notes
Landmark for access to the internal jugular vein.
Model