Sternocleidomastoideus

 

Sternocleidomastoideus (-oid)

Origin: Manubrium of sternum (medial), middle 1/3 of clavicle (lateral)

Insertion: Mastoid process of temporal bone

Action: Flexes the neck anteriorly

The name is just a combo of the origins and insertion:

Sterno: sternum

cleido: relating to the clavicle

mastoideus: mastoid process

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