Muscular Tissue Lecture slides prepared by Curtis DeFriez Weber State University Like nervous tissue muscles are excitable or irritable they have the ability to respond to a stimulus Unlike nerves however muscles are also ID: 276179
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Slide1
Chapter 10
Muscular Tissue
Lecture slides prepared by Curtis DeFriez, Weber State UniversitySlide2
Like nervous tissue, muscles are excitable or "irritable”
they have the ability to respond to a stimulusUnlike 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)
Functions of Muscular TissueSlide3
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 movementsStabilize body positions and maintain
posture
Store substances within the body
using sphincters Move substances by peristaltic contractionsGenerate heat through thermogenesisFunctions of Muscular TissueSlide4
Location
Function
Appearance
Control
Skeletal
skeleton
movement, heat, posture
striated
, multi-nucleated (eccentric), fibers parallelvoluntaryCardiacheartpump blood continuouslystriated, one central nucleusinvoluntaryVisceral(smooth muscle)G.I. tract, uterus, eye, blood vesselsPeristalsis, blood pressure, pupil size, erects hairsno striations, one central nucleusinvoluntary
Three Types of Muscular TissueSlide5
(
b) Cardiac muscle(c) Visceral smooth muscle
(
a) Skeletal muscle
Three Types of Muscular TissueSlide6
Location
Function
Appearance
Control
Skeletal
skeleton
movement, heat, posture
striated
, multi-nucleated (eccentric), fibers parallelvoluntaryCardiacheartpump blood continuouslystriated, one central nucleusinvoluntaryVisceral(smooth muscle)G.I. tract, uterus, eye, blood vesselsPeristalsis, blood pressure, pupil size, erects hairsno striations, one central nucleusinvoluntary
Skeletal MuscleSlide7
Skeletal MuscleSlide8
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 sk
eletal muscle fiber
Skeletal MuscleSlide9
Sarcolemma
Motor neuron
Skeletal Muscle
The terminal processes of a motor neuron in close proximity to the sarcolemma of a skeletal muscle fiberSlide10
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)
Organization of Muscle TissueSlide11
Organization of Muscle Tissue
Organization of a single muscle belly
Epimysium
PerimysiumSlide12
Organization of a fasciculus
Organization of Muscle TissueSlide13
Organization of a muscle fiber
Organization of Muscle TissueSlide14
A muscle, a fasciculus, and a fiber all visualized
Organization of Muscle TissueSlide15
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
Organization of Muscle TissueSlide16
Organization of Muscle Tissue
Many large muscle groups are encased in both a superficial and a deep fascia
Real Anatomy, John Wiley and Sons