Histology Muscle

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Skeletal Muscle in Cross Section : 

Skeletal Muscle in Cross Section M= muscle fiber (cell) CT=connective tissue surrounding the muscle fascicles BV=blood vessels

Skeletal Muscle in Cross Section : 

Skeletal Muscle in Cross Section N= muscle nuclei in their typical peripheral location in the fiber (i.e. under the cell membrane) BV=blood vessels ( * ) (capillaries) *

Skeletal muscle in longitudinal section : 

Skeletal muscle in longitudinal section Note the cylindrical fibers with striations Perifferal muscle cell nuclei ( ) Red blood cells ( ) stacked in capillaries

Skeletal muscle in longitudinal section : 

Skeletal muscle in longitudinal section Z line (Z) A band (b) I band (I) Sarcomere (c) Endothelial cell nuclei (e) Muscle cell nuclei (m) Z I m c

EM of skeletal myofibrils in longitudinal section : 

EM of skeletal myofibrils in longitudinal section 1=M band ( ) containing H line 2=triad at the A/I band junction (cross section) 3=oblique section of a triad 4=Z line in the middle of the I band identify the A band

Cardiac Muscle : 

Cardiac Muscle Cross section Irregular profiles Centrally located nucleus (white spots)

Cardiac muscle in cross section : 

Cardiac muscle in cross section The nuclei ( ) are located in the center of each fiber. Note the variable size of the muscle fibers and nuclei in cross-section.

Cardiac muscle in longitudinal section : 

Cardiac muscle in longitudinal section CT=connective tissue ID=intercalated discs branching fibers ( ) Note: Cardiac muscle has striations, branching fibers, and intercalated discs

Cardiac muscle in longitudinal section : 

Cardiac muscle in longitudinal section ID=intercalated discs ID ID

Smooth muscle in cross section : 

Smooth muscle in cross section a=longitudinal section b=parasympa-thetic ganglion c=cross section d=C. T. e=serous gland cells

Smooth muscle in cross section : 

Smooth muscle in cross section N=muscle nuclei F=fibroblast nuclei CT=Connective Tissue Fibers without nuclei * Note: Smooth muscle has small fibers (cells) with centrally located nuclei

Smooth muscle in longitudinal section : 

Smooth muscle in longitudinal section Smooth muscle with euchromatic nuclei in longitudinal section Dark (hetero-chromatic) nuclei belong to fibroblasts.

Smooth muscle in longitudinal section : 

Smooth muscle in longitudinal section N=nuclei in contracted smooth muscle

Smooth muscle in the Iris : 

Smooth muscle in the Iris sphincter pupillary muscle of the iris