T. Clark Brelje, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
Robert L. Sorenson, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
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The longitudinal section of cardiac muscle stained with PTH shows the morphology of individual cardiac muscle cells, and in particular, the intercalated discs.
Branched Cells - cells are joined end-to-end and are often branched. They are 50 to 250 µm in length
Nuclei - cells have a single or occasionally two centrally located nuclei.
Intercalated Disks - cells are joined together by specialized junctions called intercalated disks. They appear as dark purple bands across muscle fibers.
Lipofuscin Pigment - residue of lysosomal digestion that accumulates as yellow-brown granules next to the nucleus of some cells.