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1.04 STRUCTURES OF THE MUSCULAR SYSTEM

Explore the intricate structures of the muscular system, including muscle fibers, connective tissues, and types of muscles like skeletal, smooth, cardiac, and sphincter. Learn about the roles and characteristics of different muscle types. Unravel the mysteries of how skeletal muscles are named and their functions in various body parts.

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1.04 STRUCTURES OF THE MUSCULAR SYSTEM

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  1. 1.04STRUCTURES OF THE MUSCULAR SYSTEM

  2. 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

  3. The Muscular System:Muscle Fibers • Bundles of threadlike structures called myofibrils • Composed of: • Myosin- thick myofibrils made of proteins • Actin- thin myofibrils made of proteins • Form overlapping pattern called sarcomere muscle muscle fiber sarcolemma sarcomere functional unit of muscle movement 1.04 Remember the structures of the muscular system

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

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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. How do skeletal muscles get their names? • Location-where • Size-maxi/mins • Number of origins • Number/Location of origin and insertion • Action • Shape • Combination 1.04 Remember the structures of the muscular system • However, • not all muscles are named by the above methods!

  13. Head & Neck Muscles pg. 204-205 1.04 Remember the structures of the muscular system

  14. Torso/Trunk pg 204-205(anterior) 1.04 Remember the structures of the muscular system

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

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

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

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

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