Chapter 9: Muscular System Naming Muscles
Direction of fascicles relative to midline Examples Rectus = parallel transverse = perpendicular oblique = 45 degree angle Examples in Human Rectus abdominis Transversus Abdominis External Oblique
Location (i.e. the bone or body part that a muscle covers) Examples Frontal Bone Tibia Examples in Human Frontalis Tibialis Anterior
Relative Size Examples in Human Palmaris Longus Peroneus Longus Maximus = largest Longus = longest Brevis = shortest Examples in Human Gluteus Maximus Palmaris Longus Peroneus Longus
Number of Origins Examples in Human Example Biceps = 2 origins Triceps = 3 origins Examples in Human Biceps Brachii Triceps Brachii
Shape Examples in Human Example Deltoid = triangle Trapezius = trapezoid Serratus = saw-toothed Orbicularis = circular Examples in Human Deltoid Trapezius Serratus Anterior Orbicularis Oris
Location of Origin and/or Insertion Example Origin = sternum Insertion = mastoid process Examples in Human Sternocleidomastoid
Action of Muscle Examples in Human Example Flexion Extension Adduction Flexor carpi radialis Extensor digitorum Adductor longus