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Chapter 10 Muscular Tissue

Chapter 10 Muscular Tissue. Lecture slides prepared by Curtis DeFriez, Weber State University. Functions of Muscular Tissue. Like nervous tissue, muscles are excitable or "irritable” they have the ability to respond to a stimulus Unlike nerves, however, muscles are also:

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Chapter 10 Muscular Tissue

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  1. Chapter 10 Muscular Tissue Lecture slides prepared by Curtis DeFriez, Weber State University

  2. Functions of Muscular Tissue • Like nervous tissue, muscles are excitable or "irritable” • they have the ability to respond to a stimulus • Unlike nerves, however, muscles are also: • Contractible(they can shorten in length) • Extensible(they can extend or stretch) • Elastic(they can return to their original shape)

  3. Functions of Muscular Tissue • Muscle makes up a large percentage of the body’s weight • Their main functions are to: • Create motion– muscles work with nerves, bones, and joints to produce body movements • Stabilize body positions and maintain posture • Store substances within the body using sphincters • Move substances by peristaltic contractions • Generate heat through thermogenesis

  4. Three Types of Muscular Tissue

  5. Three Types of Muscular Tissue (a) Skeletal muscle (c) Visceral smooth muscle (b) Cardiac muscle

  6. Skeletal Muscle

  7. Skeletal Muscle

  8. Skeletal Muscle • Skeletal muscle fibers are very long “cells” - next to neurons (which can be over a meter long), • perhaps the longest in the body • The Sartorious muscle contains • single fibers that are at least • 30 cm long A single skeletal muscle fiber

  9. Skeletal Muscle The terminal processes of a motor neuron in close proximity to the sarcolemma of a skeletal muscle fiber Motor neuron Sarcolemma

  10. Organization of Muscle Tissue • The epimysium, perimysium, and • endomysium all are continuous with • the connective tissues that form • tendons and ligaments (attach • skeletal muscle to bone) and muscle • fascia (connect muscles to other • muscles to form groups of muscles)

  11. Organization of Muscle Tissue Epimysium Perimysium Organization of a single muscle belly

  12. Organization of Muscle Tissue Organization of a fasciculus

  13. Organization of Muscle Tissue Organization of a muscle fiber

  14. Organization of Muscle Tissue A muscle, a fasciculus, and a fiber all visualized

  15. Organization of Muscle Tissue • In groups of muscles the epimysium continues to become thicker, forming fascia which covers many muscles • This graphic shows the fascia lata enveloping the entire group of quadriceps and hamstring muscles in the thing

  16. Organization of Muscle Tissue • Many large muscle groups are encased in both a superficial and a deep fascia Real Anatomy, John Wiley and Sons

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