The basic topics you would want to learn are: 1  definition of categories, and some examples of categories. 2  functors, and examples of them. 3  natural transformations, and examples of them. 4  definitions of products, coproducts and exponents (function spaces), initial and terminal objects.
Sternocleidomastoid muscle. In human anatomy, the sternocleidomastoid muscle (/ËstÉËrnoÊËklaÉªdÉËmÃ¦sËtÉÉªd, -nÉ-, -doÊ-/[1][2]), also known as sternomastoid and commonly abbreviated as SCM, 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 sternocleidomastoid (SCM) originates at two heads: the sternum and the clavicle. These two heads ascend and blend to form one thick rope-like muscle which inserts at the mastoid process of the temporal bone. When both SCM muscles contract the head is tilted.