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MUSCLE
Lab # 3August 16, 2010
ASMPH 2015
SKELETAL MUSCLE (STRIATED MUSCLE)
Striated Muscle l.s.
On yellow pointers: NUCLEUS of the Muscle
Striated Muscle l. s.
Dark Band (A band): very fine light space in between is the H band, where the M line is found.
Light Band (I band): very light line in between is the Z line
Middle of light band to another middle of light band (Z line to Z line) = sarcomere
Observe the alternating light and dark bands
Multi-nucleated
Striated Muscle l. s.
Light Band (I band): very light line in between is the Z line
Dark Band (A band): very fine light space in between is the H band, where the M line is found.
Middle of light band to another middle of light band (Z line to Z line) = sarcomere
Nucleus
Sarcomere: from the Net
Striated Muscle (c.s.) -- LPO
Fascicle•Enclosed within red dashed lines•Group of muscle cells
Perimysium•Connective tissue that surrounds fascicles
Striated Muscle (c.s.) -- HPO
Fascicle•Encircled within red dashed lines•Group of muscle cells
Perimysium•Connective tissue that surrounds fascicles
Striated Muscle (Scanner 40x)
Perimysium
Blood vessel
Striated Muscle (LPO 100x)
Perimysium
Endomysium
Fascicle
Blood vessel
SMOOTH MUSCLE
Smooth muscle l.s.
Note: Spindle shaped cell, centrally located nucleus and eosinophilic cytoplasm
Smooth Muscle c.s. l.s.
Duodenum HD168
Smooth muscles of the Outer wall of
the GIT
Inner circumferential (circular) layer
Outer longitudinal layer
Esophagus HD159A Lower Region
Smooth muscles of the Outer wall of
the GIT
Outer longitudinal layer
Inner circumferential (circular) layer
Muscularis propria
Smooth Muscle: Jejunum (LPO)
Smooth Muscle: Jejunum (HPO) L.S.
Smooth Muscle: Jejunum (HPO)
ILEUM (4x)
Outer longitudinal layer
Inner circumferentially-arranged layer
ILEUM (10x)
Outer longitudinal layer
Inner circumferentially-arranged layer
ILEUM (40x)
Outer longitudinal layer
Inner circumferentially-arranged layer
Epithelial Layer
Connective Tissue Layer
Inner Smooth Muscle Layer
Outer Smooth Muscle Layer
Large Intestine
Large Intestine
Outer longitudinal layer of smooth
muscle
Inner circumferential layer of smooth
muscle
Large Intestine, HPOInner circumferential layer of
smooth muscle
Large Intestine, HPOOuter longitudinal layer
of smooth muscle
Smooth Muscle: Arrector Pili
Shown on pointer
- Part of the pilosebaceous unit (with hair follicle and sebaceous gland)
- Makes hair stand on end
Smooth Muscle: Arrector Pili
On pointer: Close-up of arrector pili muscle
ARTERY AND VEIN [LPO]
Smooth Muscle
SMOOTH MUSCLE - ARTERY AND VEIN [HPO]
Tunica MediaSmooth Muscle cells (and elastic fibers)
ARTERY AND VEIN [HPO]Tunica Intima- Endothelium and elastic fibers
Tunica Adventitia- collagen and elastic fibers
CARDIAC MUSCLE
Cardiac Muscle Heart (l.s.)
Nuclei
IntercalatedDiscs