Sternocleidomastoid means sternum-wrench leg-nipple muscle
The Musculus Sternocleidomastoidicus is a two-headed muscle in neck, with attachment to the shoulder belt. It is also called the sternum-cleft-nipple muscle, because one head begins to the sternum and the other to the wrench bone. The muscle can cause the head to bend and rotate, in addition it has a (low) functionality on the shoulder belt and helps with the elevation, it is therefore also counted as the auxiliary ademhalingsspieren. When you turn your head or tilt you feel the muscle from your chest and wrench to just behind your ear.