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‫بسم هللا الرحمن الرحيم‬
‫‪Muscular Tissues‬‬
Introduction
These tissue form the muscle of the body.
Composed of muscle cells or muscle fibers
(contraction and relaxation).
Most of their cytoplasm modified into
contractile threads (Myofibrils).
Special terms: Sarcolemma= plasma
membrane, Sarcopalsm= cytoplasm,
Sarcopalsmic reticulum=E.R.
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Smooth Muscle
Composed of elongated, fusiform - muscle cell
with a single central nucleus.
Continuous contraction
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Smooth Muscle
They contract in a similar pattern to skeletal
muscle but the myofibrils are scattered in
sarcoplasm overlapping each other and no
striations.
Involuntary
Found in blood vessels walls, viscera (intestine,
uterus, urethras)
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Skeletal Muscle
Skeletal muscle are responsible for movement of
the skeleton and organs as the globe of the eye
and the tongue.
Voluntary muscle.
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Composed of bundles of very long cylindrical
multi-nucleated cells (muscle fibers).
The nuclei periphery of cell under the
sarcolemma .
A syncytium .
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The sarcoplasm contains longitudinal fibrils
(myofibrils)
They are contractile threads, arranged
longitudinally in sarcoplasm in each muscle
fibers.
Striation
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Epimycium COVERING THE WHOLE MUSCLE.
The green arrows Perimycium
The yellow arrow endomycium
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Cardiac Muscle
Found in the heart only.
Their fibers are characterized by their rhythmic
contractions which produce heart beats.
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