sternocleidomastoid 

In human anatomy, the sternocleidomastoid is a paired muscle in the superficial layers of the side of the neck. It 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.

It is given the name sternocleidomastoid because it originates at the manubrium of the sternum and the clavicle, and has an insertion at the mastoid process of the temporal bone of the skull.

Guy: Sorry, Teacher, I am afraid I cant assist to class today...
Teacher: Oh, but how come?
Guy: I broke my sternocleidomastoid.
Teacher: Say no more, fella, I'll send you the homework via email and get well soon?

sternocleidomastoid by Frank Greene January 28, 2016

sternoclidomastoid 

the sternoclidomastoid is a word that u might hear when u r in health class (bouring)(lol but its still a cool word.) it is locxated where your sternum is witch is also called the breast bone. The sternoclidomastoid has a name like this because it is near the sternum witch is sterno and the clavicle (sholder blade)clido and the mandable(jaw) mastoid

the sternoclidomastoid is a muscle on your body like your hamstring but that is just another muscle it has nothing to do with it lol

sternoclidomastoid by Andrew May 13, 2005