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