Skeletal_muscles are named using these criteria: the direction of the muscle fibers, the relative size of the muscle, the location of the muscle, the number of origins, the location of the origin and insertion, the shape of the muscle and the specific action that the muscle performs.

There are various types of skeletal muscle actions, including prime_movers (agonists), antagonists, synergists, and fixators.

NOTE:

(1) The acromiotrapezius and spinotrapezius cover the supraspinatus and the infraspinatus, respectively.

(2) Cats have a rhomboid_group, but humans have a single rhomboideus muscle. The cat rhomboid group includes the rhomboid_capitis, rhomboid_minor, and rhomboid_major.