Naming Skeletal Muscles Human Anatomy and Physiology

Naming Skeletal Muscles Based on several criteria: Direction of muscle fibers Relative size of the muscle Location of the muscle Number of origins Location of the muscle’s origin and insertion Shape of the muscle Action of the muscle

Naming Skeletal Muscles Direction of Muscle Fibers Rectus: straight Oblique: slanted

Naming Skeletal Muscles Relative size of muscle Maximus: largest Minimus: smallest Longus: long

Naming Skeletal Muscles Location of the muscle Temporalis muscle overlies the temporal bone Frontalis muscle overlies the frontal bone

Naming Skeletal Muscles Number of origins Biceps: two origins Triceps: three origins Quadriceps: four origins

Naming Skeletal Muscles Location of the muscle’s orgin and insertion Named for their attachment sites Sternocleidomastoid muscle : origin on the sternum (sterno), the clavicle (cleido) and inserts on the mastoid process (mastoid) of the temporal bone

Naming Skeletal Muscles Shape of the muscle Deltoid muscle is triangular and deltoid means triangular

Naming Skeletal Muscles Action of the muscle Extensor: extensor muscles of the wrist an all extend the wrist Adductor: adductor muscles of the thigh all bring about its adduction.