Muscle Identification ANTERIOR MUSCLES OF THE HEAD & NECK Neck Action Sternocleidomastoid Muscles of Face/Facial Expression Action Frontalis Orbicularis Oculi Zygomaticus Orbicularis Oris Mastication (Chewing) Masseter Temporalis Buccinator (not on diagram) Action Muscle Identification ANTERIOR MUSCLES OF TRUNK & UPPER LIMBS Arm & Shoulder Action Deltoid Biceps Brachii Brachialis Flexor Carpi Radialis Trunk/Abdominal Wall Action Pectoralis Major Rectus Abdominus External Oblique ANTERIOR MUSCLES OF HIP & LOWER LIMBS Hip Action Sartorius Thigh Action Quadriceps (Vastus Medialis, Vastus Intermedius, Vastus Lateralis, & Rectus Femoris) Leg Tibialis Anterior Action Muscle Identification POSTERIOR MUSCLES OF NECK, TRUNK & UPPER LIMBS Neck Action Trapezius Arm & Forearm Action Triceps Brachii Flexor Carpi Ulnaris Extensor Carpi Radialis Extensor Carpi Ulnaris Trunk Action Latissimus Dorsi POSTERIOR MUSCLES OF HIP & LOWER LIMB Hip Action Gluteus Maximus Gluteus Medius Thigh Action Hamstrings Leg Gastrocnemius Action