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 muscle muscle fiber sarcolemma sarcomere functional unit of muscle movement 1.04 Remember the structures of the muscular system

5. Structures of the muscular system Connective tissue • Tendons • Fascia Muscles • Skeletal • Smooth • Cardiac • Sphincter 1.04 Remember the structures of the muscular system

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

7. Structures of the muscular system Types of Muscle Skeletal muscles • Attached to bone • Striated (striped) appearance • Voluntary • Multinucleated muscle cell bundles 1.04 Remember the structures of the muscular system

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

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

10. 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

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

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

13. 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

14. 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

15. How do skeletal muscles get their names? • Location • Size • Direction • Number of origins • Location of origin and insertion • Action flexor • Extensor • Depressor • However, • not all muscles are named by the above methods! 1.04 Remember the structures of the muscular system

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

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

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

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

20. Upper extremities 1.04 Remember the structures of the muscular system

21. Lower extremities 1.04 Remember the structures of the muscular system

22. The muscular system reviewAnterior view 1.04 Remember the structures of the muscular system

23. The muscular system reviewPosterior view 1.04 Remember the structures of the muscular system

24. 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