What are the major characteristics considered for muscle taxonomy?

Location, Size, Shape, Direction, Number of heads, Action Location: ex-> Temporalis (near skull's temple) Size: Gluteus maximus (largest in that area) Shape: Serratus anterior (serrated edge) Direction: External oblique (runs obliquely) #of Heads: Biceps brachii (2 heads) Action: Flexor digitorum (flexes toes)