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Muscles Muscles 700 skeletal muscles For each muscle: Name Location Origin Insertion Movement Organization of Muscle Fibers Parallel Muscles Fascicles = parallel to long axis of muscle When contracted: Organization of Muscle Fibers Convergent Muscles Fibers are spread over a large area, but come together at a common site Fibers all pull in separate directions Organization of Muscle Fibers Pennate Muscles Fascicles form common angle with tendon Unipennate – Bipennate – Multipennate - Organization of Muscle Fibers Circular Muscles Fibers are concentrically arranged around an opening When muscle contracts – Muscle Terminology Origin – Insertion – Action – Gastrocnemius Origin – Insertion Action – – Muscle Terminology Actions Almost all originate or insert on skeleton 2 methods: Bones affected Joints affected Muscle Terminology Agonist – contraction is responsible for movement Biceps brachii – Antagonist – Triceps brachii - Synergist – helps agonist Most useful at start of contraction Muscle Terminology Fascicle Organization Rectus Tranverse Oblique – Location Temporalis Brachialis Gluteus Glossus - Muscle Terminology Relative Position Superficialis , externus– Internus, profundus – Extrinsic – Intrinsic – Structural Features Biceps – Triceps – Quadriceps – Muscle Terminology Shape Trapezius Deltoid Rhomboidus Orbicularis - Length Longus, teres – Brevis – Size Maximus, major Minimus, minor - Muscle Terminology Origin and Insertion Sacrospinalis – Sternocleidomastoid – Function Extensor/flexor Supinator Adductor - Association Sartoris – Buccinator – 1. Define origin and insertion. 1. Name the origin and insertion of the styloglossus. 2. What action does the flexor carpi ulnaris perform? Former Canadian Prime Minister Jean Chrétien acquired Bell's palsy in his youth which never resolved Muscles of the Head Orbicularis oris Location Origin Insertion Movement Orbicularis oculi Location Origin Insertion Movement Muscles of the Head Buccinator Location Origin Insertion Movement Masseter Location Origin Insertion Movement Muscles of the Head Temporalis Location Origin Insertion Movement Zygomaticus major Location Origin Insertion Movement Muscles of the Head Risorius Location Origin Insertion Movement Frontalis Location Origin Insertion Movement Muscles of the Head Platysma Location Origin Insertion Movement Muscles of the Neck Sternocleidomastoid Location Origin Insertion Movement Hyoid 1. Where does the temporalis muscle insert? 2. What movement is the orbicularis oris responsible for? 3. What movement is the orbicularis oculi responsible for? 4. Where does the buccinator originate? Abdominal Muscles Transversus Abdominis Location Origin Insertion Movement Rectus Abdominis Location Origin Insertion Movement Abdominal Muscles Internal Oblique Location Origin Insertion Movement External Oblique Location Origin Insertion Movement Ribcage Muscles Internal Intercostals Location Origin Insertion Movement External Intercostals Location Origin Insertion Movement Ribcage Muscles Diaphragm Location Origin Insertion Movement 1. Which layer of abdominal muscle is the most internal? 2. What is the movement of the rectus abdominus muscles? 3. What is the origin of the sternocleidomastoid muscle? 4. Which muscle depresses the jaw? Muscles of the Leg Gluteus Maximus Location Origin Insertion Movement Gluteus Medius Location Origin Insertion Movement Muscles of the Leg Gluteus Minimus Location Origin Insertion Movement Muscles of the Leg Semimembranosus Location Origin Insertion Movement Semitendinosus Location Origin Insertion Movement Muscles of the Leg Biceps femoris Location Origin Insertion Movement Muscles of the Leg Gracilis Location Origin Insertion Movement Adductor brevis Location Origin Insertion Movement Muscles of the Leg Adductor longus Location Origin Insertion Movement Adductor magnus Location Origin Insertion Movement Muscles of the Leg Sartorius Location Origin Insertion Movement Rectus femoris Location Origin Insertion Movement Muscles of the Leg Vastus lateralis Location Origin Insertion Movement Vastus medialis Location Origin Insertion Movement Muscles of the Leg Vastus intermedias Location Origin Insertion Movement Muscles of the Leg Tibialis anterior Location Origin Insertion Movement Muscles of the Leg Soleus Location Origin Insertion Movement Gastrocnemius Location Origin Insertion Movement Muscles of the Back Trapezius Location Origin Insertion Movement Rhomboids Location Origin Insertion Movement Muscles of the Back Levator scapulae Location Origin Insertion Movement Pectoralis minor Location Origin Insertion Movement Muscles of the Back Serratus anterior Location Origin Insertion Movement Muscles Acting on the Shoulder Teres Major Location Origin Insertion Movement Deltoid Location Origin Insertion Movement Muscles Acting on the Shoulder Pectoralis major Location Origin Insertion Movement Latissimus dorsi Location Origin Insertion Movement Muscles Acting on the Forearm Biceps brachii Location Origin Insertion Movement Brachialis Location Origin Insertion Movement Muscles Acting on the Forearm Triceps brachii Location Origin Insertion Movement Muscles Acting on the Forearm Flexors + palmaris longus Location Origin Insertion Movement Extensors Location Origin Insertion Movement
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