1.04 Remember the structures of the muscular system

1. 1.04 Remember the structures of the muscular system

2. Essential Question • What are the structures of the muscular system? 1.04 Remember the structures of the muscular system

3. The Muscular System • Comprises nearly half our weight. • Over 650 muscles. • Each muscle is made up of hundreds or thousands of muscle fibers. 1.04 Remember the structures of the muscular system

4. The Muscular System:Muscle Fibers • Bundles of threadlike structures called myofibrils • Composed of: • Myosin • Actin • Form overlapping pattern called sarcomere • https://www.youtube.com/watch?v=PaNFWYO1lb4 1.04 Remember the structures of the muscular system

5. Muscles are made up of muscle fibers which are made up of myofibrils which are broken into segments called sarcomeres which have thin actin filaments and thick myosin filaments that slide across each other to produce the shortening of muscle contractions. 1.04 Remember the structures of the muscular system

6. Structures of the muscular system Connectivetissue • Tendons • Fascia Muscles • Skeletal • Smooth • Cardiac • (Sphincter) 1.04 Remember the structures of the muscular system

7. Structures of the muscular system Types of muscle • Skeletal • Smooth • Cardiac • (Sphincter) 1.04 Remember the structures of the muscular system

8. Structures of the muscular system Types of Muscle Skeletal muscles • Attached to bone • Striated (striped) appearance • Voluntary 1.04 Remember the structures of the muscular system

9. Structures of the muscular system Types of Muscle Smooth muscles • Also known as visceral muscles • Involuntary • Located in walls of digestive system organs, uterus & blood vessels 1.04 Remember the structures of the muscular system

10. Structures of the muscular system Types of Muscle Cardiac muscle • Found only in the heart • Striated • Involuntary • Cells are fused- when one contracts, they all contract, creating the heartbeat 1.04 Remember the structures of the muscular system

11. Structures of the muscular system Types of Muscle Sphincter muscles • Also called dilator muscles • Special, circular muscles • Located in the • digestive system • urinary system 1.04 Remember the structures of the muscular system

12. Structures of the muscular system Types of Muscle • Skeletal • Smooth • Cardiac • Sphincter 1.04 Remember the structures of the muscular system

13. Structures of the muscular system Types of Connective tissue • Tendons • Fascia 1.04 Remember the structures of the muscular system

14. Structures of the muscular system Connective tissue • Tendons dense bands that connect skeletal muscle to the bone 1.04 Remember the structures of the muscular system

15. Structures of the muscular system Connective tissue • Fascia Fibrous connective tissue sheets that wrap around muscle bundles 1.04 Remember the structures of the muscular system

16. How do skeletal muscles get their names? • Location • frontalis = forehead • Size • Gluteus maximus = largest in buttock • Direction • External abd oblique = oblique means slanted • Number of origins • Biceps = two headed muscle • Location of origin and insertion • Sternocleidomastoid = originates in sternum • Action flexor • Flexor carpi ulnaris = flexes wrist • Extensor • Extensor carpi ulnaris = extends wrist • However, not all muscles are named by the above methods! 1.04 Remember the structures of the muscular system

17. Major Skeletal Muscles

18. Head & Neck Muscles 1.04 Remember the structures of the muscular system

19. Torso/Trunk (anterior) 1.04 Remember the structures of the muscular system

20. Torso/Trunk (anterior)

21. Torso/Trunk (posterior)

22. Upper extremities

23. Lower extremities

24. The muscular system review Anterior view

25. The muscular system review Posterior view

26. 1.04 Remember the structures of the muscular systemEssential Question • What are the structures of the muscular system? 1.04 Remember the structures of the muscular system