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Muscles to Know For all listed muscles, know location and action. For muscles in bold, also know the origin and insertion. Scalp & face Occipitofrontalis Orbicularis oris, orbicularis oculis External ocular muscles Lateral rectus, medial rectus, superior rectus, inferor rectus, superior oblique, inferior oblique Mastication Masseter Temporalis Neck & vertebral column Sternocleidomastoid Platysma Erector spinae (iliocostalis, longissimus, spinalis) Quadratus lumborum Breathing Diaphragm External and internal intercostals Abdominal Wall & Pelvic Floor Rectus abdominus External oblique Internal oblique Coccygeus Levator ani Superficial thoracic, scapular/clavicular Pectoralis minor Serratus anterior Trapezius Levator scapulae Rhomboids (major/minor) Crossing the shoulder Pectoralis major Latissimus dorsi Deltoid Rotator Cuff Supraspintus Infraspinatus Teres minor Subscapularis Teres major Coracobrachialis Crossing the elbow Triceps brachii Biceps brachii Brachialis Brachioradialis Forearm Pronator teres Pronator quadratus Supinator Flexor digitorum superficialis, profundus Flexor pollicis longus Extensor digitorum Extensor pollicis longus Crossing the hip and knee Ilio-psoas Adductor longus Adductor magnus Gracilis Sartorius Tensor fasciae latae (TFL) Quadriceps femoris Rectus femoris Vastus lateralis Vastus medialis Vastus intermedius Gluteus maximus Gluteus medius Gluteus minimus Piriformis Hamstrings Biceps femoris Semitendinosis Semimembranosis Crossing the ankle and foot Tibialis anterior Extensor digitorum longus Extensor hallicus longus Fibularis (longus, brevis) Gastrocnemius Soleus Popliteus Flexor digitorum longus Flexor hallicus longus Tibialis posterior Copyright © 2016, William C. Rose