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Muscle, Demonstrations

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Skeletal Muscle in Long. Section at high mag. (100X Objective). Note banding that is visible in light microscope.

Skeletal Muscle cut in cross (transverse) section. Note that the roughly circular profiles have their nucei on the periphery of the cell.

Cardiac Muscle in Logitudinal Section

Note intercalated discs, centrally, nuclei and branching fibers.

Purkinji fibers. These cells act like nerve cells and carry impulses through the ventricles of the heart.

Pukinje Fibers Stained with Iron Hematoxylin

Compare PF with regular Cardiac Muscle Fibers. Note larger numbers of Myofibrils and smaller cell size in regular Cardiac Muscle Fibers

Smooth muscle cut in longitudinal section. Note fusiform shaped cells with the nuclei centrally located.

Smooth muscle cells which have been teased free of other cells. The fusiform shape and central nucleus of each cell is obvious.

Smooth muscle cut in transverse section. Note the various sized profiles depending on where the individual smooth muscle cell was sectioned. Also notice that only the largest profiles have nuclei.

What is at (?) ?

Neuromuscular Junctions

Indvidual junction (circled)

is called Motor End Plate.