muscle tissue - university of jordan …...comparison of the 3 types of muscles feature skeletal...
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Muscle tissue
Practical part
Dr. Heba Kalbouneh Associate Professor of Anatomy and Histology
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Skeletal muscle
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Epimysium
Perimysium
Endomysium
Muscle cell
Muscle
bundle
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Perimysium
6
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How many fascicles in this section??
1 4
3
2
5
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Sarcomere
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Muscle spindle
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Characteristics
Type I
Type IIa
Type IIb Vascularization
Rich
Rich
Poorer
Innervation
Small nerve fibres
Intermediate
Larger nerve fibres
Fibre Diameter
Smaller
Intermediate
Larger
Contraction
Slow, repetitive, weak
Fast (leg muscles)
Fast, strong (extra-
(soleus, muscles of
ocular muscles)
the back)
Fatiguability
Difficult
Intermediate
Easy
Sarcoplasmic
Not extensive
Intermediate
Extensive
reticulum
Mitochondria
Rich
Rich
Few
Myoglobin
Rich
Rich
Poor
Glycogen content
Low
Intermediate
High
ATPase activity
Low
High
High
Major source of
Oxidative
Oxidative
Anaeorbic glycolysis
ATP
phosphorylation
phosphorylation
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Myotendinous junction
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Tongue
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Cardiac muscle
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37
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Smooth muscle
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Comparison of the 3 types of muscles Feature
Skeletal Muscle
Cardiac Muscle
Smooth Muscle
Sarcomere
Yes
Yes
No
Nuclei
Multinucleated, peripherally
1 or 2 centrally located
One, centrally located located
Sarcoplasmic
Well developed with terminal
Poorly defined, some small
Some sER (not involved in Reticulum
cisterna
terminals
calcium storage)
T Tubule
Yes: involved in triad formation
Yes: involved in diad formation
No
Cell Junctions
No
Intercalated disks
Nexus (gap junctions)
Contraction
Voluntary “all or none”
Involuntary: rhythmic and
Involuntary: slow and forceful spontaneous
Calcium Binding
Troponin C
Troponin C
Calmodulin
Regeneration
Limited, via satellite cells
No-very poor
Yes, via mitosis
Nerve Fibres
Somatic motor
Autonomic
Autonomic
Connective Tissue
Epimysium; perimysium and
Connective tissue sheaths and
Connective tissue sheaths and endomysium
endomysium
endomysium
Distinctive Features
Long, cylindrical, many
Branched cells, intercalated disks,
Fusiform cells, no striations, peripheral nuclei
central nucleus
central nucleus 4