Muscles

1. Muscles

2. Muscles • 700 skeletal muscles • For each muscle: • Name • Location • Origin • Insertion • Movement

3. Organization of Muscle Fibers Parallel Muscles • Fascicles = parallel to long axis of muscle • When contracted:

4. 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

5. Organization of Muscle Fibers Pennate Muscles • Fascicles form common angle with tendon • Unipennate – • Bipennate – • Multipennate -

6. Organization of Muscle Fibers Circular Muscles • Fibers are concentrically arranged around an opening • When muscle contracts –

7. Muscle Terminology Origin – Insertion – Action – Gastrocnemius • Origin – • Insertion – • Action –

8. Muscle Terminology Actions • Almost all originate or insert on skeleton 2 methods: • Bones affected • Joints affected

9. Muscle Terminology Agonist – contraction is responsible for movement • Biceps brachii – Antagonist – • Triceps brachii - Synergist – helps agonist • Most useful at start of contraction

10. Muscle Terminology Fascicle Organization • Rectus - • Tranverse - • Oblique – Location • Temporalis - • Brachialis - • Gluteus - • Glossus -

11. Muscle Terminology Relative Position • Superficialis , externus– • Internus, profundus – • Extrinsic – • Intrinsic – Structural Features • Biceps – • Triceps – • Quadriceps –

12. Muscle Terminology Shape • Trapezius - • Deltoid - • Rhomboidus - • Orbicularis - Length • Longus, teres – • Brevis – Size • Maximus, major - • Minimus, minor -

13. Muscle Terminology Origin and Insertion • Sacrospinalis – • Sternocleidomastoid – Function • Extensor/flexor - • Supinator - • Adductor - Association • Sartoris – • Buccinator –

14. Define origin and insertion. • Name the origin and insertion of the styloglossus. • What action does the flexor carpi ulnaris perform?

15. Former CanadianPrime MinisterJean Chrétien acquired Bell's palsy in his youth which never resolved

16. Muscles of the Head Orbicularis oris Location Origin Insertion Movement Orbicularis oculi Location Origin Insertion Movement

17. Muscles of the Head Buccinator Location Origin Insertion Movement Masseter Location Origin Insertion Movement

18. Muscles of the Head Temporalis Location Origin Insertion Movement Zygomaticus major Location Origin Insertion Movement

19. Muscles of the Head Risorius Location Origin Insertion Movement Frontalis Location Origin Insertion Movement

20. Muscles of the Head Platysma Location Origin Insertion Movement

21. Muscles of the Neck Sternocleidomastoid Location Origin Insertion Movement Hyoid

22. 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?

23. Abdominal Muscles Transversus Abdominis Location Origin Insertion Movement Rectus Abdominis Location Origin Insertion Movement

24. Abdominal Muscles Internal Oblique Location Origin Insertion Movement External Oblique Location Origin Insertion Movement

25. Ribcage Muscles Internal Intercostals Location Origin Insertion Movement External Intercostals Location Origin Insertion Movement

26. Ribcage Muscles Diaphragm Location Origin Insertion Movement

27. Which layer of abdominal muscle is the most internal? • What is the movement of the rectus abdominus muscles? • What is the origin of the sternocleidomastoid muscle? • Which muscle depresses the jaw?

28. Muscles of the Leg Gluteus Maximus Location Origin Insertion Movement Gluteus Medius Location Origin Insertion Movement

29. Muscles of the Leg Gluteus Minimus Location Origin Insertion Movement

30. Muscles of the Leg Semimembranosus Location Origin Insertion Movement Semitendinosus Location Origin Insertion Movement

31. Muscles of the Leg Biceps femoris Location Origin Insertion Movement

32. Muscles of the Leg Gracilis Location Origin Insertion Movement Adductor brevis Location Origin Insertion Movement

33. Muscles of the Leg Adductor longus Location Origin Insertion Movement Adductor magnus Location Origin Insertion Movement

34. Muscles of the Leg Sartorius Location Origin Insertion Movement Rectus femoris Location Origin Insertion Movement

35. Muscles of the Leg Vastus lateralis Location Origin Insertion Movement Vastus medialis Location Origin Insertion Movement

36. Muscles of the Leg Vastus intermedias Location Origin Insertion Movement

37. Muscles of the Leg Tibialis anterior Location Origin Insertion Movement

38. Muscles of the Leg Soleus Location Origin Insertion Movement Gastrocnemius Location Origin Insertion Movement

39. Muscles of the Back Trapezius Location Origin Insertion Movement Rhomboids Location Origin Insertion Movement

40. Muscles of the Back Levator scapulae Location Origin Insertion Movement Pectoralis minor Location Origin Insertion Movement

41. Muscles of the Back Serratus anterior Location Origin Insertion Movement

42. Muscles Acting on the Shoulder Teres Major Location Origin Insertion Movement Deltoid Location Origin Insertion Movement

43. Muscles Acting on the Shoulder Pectoralis major Location Origin Insertion Movement Latissimus dorsi Location Origin Insertion Movement

44. Muscles Acting on the Forearm Biceps brachii Location Origin Insertion Movement Brachialis Location Origin Insertion Movement

45. Muscles Acting on the Forearm Triceps brachii Location Origin Insertion Movement

46. Muscles Acting on the Forearm Flexors + palmaris longus Location Origin Insertion Movement Extensors Location Origin Insertion Movement