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Skeletal Muscle Tissue

Skeletal Muscle Tissue. Skeletal Muscle Tissue Arrangement. Myofibrils – contractile elements of muscle tissue. Skeletal Muscle Cont. Muscle fiber – Muscle cell; composed of several myofibrils. Skeletal Muscle Cont.

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Skeletal Muscle Tissue

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  1. Skeletal Muscle Tissue

  2. Skeletal Muscle Tissue Arrangement • Myofibrils – contractile elements of muscle tissue

  3. Skeletal Muscle Cont. • Muscle fiber – Muscle cell; composed of several myofibrils

  4. Skeletal Muscle Cont. • Each muscle fiber is surrounded by a thin sheath of areolar connective tissue called endomysium

  5. Muscle Tissue Cont. • Fascicles – A bundle of muscle fibers. There are usually between 10 to 100 muscle fibers in a fascicle.

  6. Muscle Tissue Cont. • Each fascicle is surrounded by a layer of dense irregular connective tissue called perimysium

  7. Muscle Tissue Cont. • Whole muscle – made up of several fascicles

  8. Muscle Tissue Cont. • The whole muscle is surrounded by a dense irregular connective tissue called epimysium

  9. Muscle Tissue • All three connective tissues (endomysium, perimysium, epimysium) extend beyond the muscle fiber to form a tendon.

  10. Muscle Tissue • Tendon – Composed of dense regular connective tissue that attaches muscle to the periosteum of the bone

  11. General Features of Skeletal Muscle • Striated

  12. General Features of Skeletal Muscle • Voluntary

  13. General Features of Skeletal Muscle • Multinucleated

  14. General Features of Skeletal Muscle • Controlled by the somatic (voluntary) division of the nervous system

  15. Microscopic Anatomy of Muscle Fibers • Muscle Fiber = Muscle Cell

  16. Microscopic Anatomy cont. • Sarcolema – plasma membrane of muscle cells or muscle fibers

  17. Microscopic Anatomy cont. • The multiple nuclei of each muscle fiber is located beneath the sarcolema

  18. Microscopic Anatomy cont. • T (tranverse tubules) – Invagination of the sarcolema that tunnel in from the surface to the center of each muscle fiber

  19. Microscopic Anatomy cont. • Sarcoplasm – cytoplasm of a muscle fiber

  20. Microscopic Anatomy cont. • Sarcoplasmic reticulum – fluid filled system of membranous sacs. Calcium is stored here.

  21. Microscopic Anatomy cont. • Dilated ends of SR are called terminal cisterns

  22. Microscopic Anatomy cont. • Myofibrils are composed of functional units called sarcomeresresponsible for the striations

  23. Microscopic Anatomy cont. • Each sarcomere is separated from the next by z discs

  24. Microscopic Anatomy cont. • Sarcomeres are composed of thick (myosin) and thin (actin) filaments

  25. Microscopic anatomy cont. • A band is the part of the sarcomere composed of thick (myosin) and thin (actin) filaments

  26. Microscopic anatomy cont. • The A band is the dark striation seen under the microscope

  27. Microscopic Anatomy cont. • I Band is the part of the sarcomere that contains only thin (actin) filaments

  28. Microscopic Anatomy cont. • I Band is the light striation seen underneath the microscope

  29. Microscopic Anatomy • The H zone is the part of the A band that contains only thick filaments (myosin)

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