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 middle specimen is a cross-section from half of a spinal cord.
Motor Neurons - large cell bodies in the ventral horn that can be more than 100 µm in diameter.
Nucleus - large with mostly euchromatin and a prominent nucleolus.
Nissl Substance - basophilic material in nerve cell bodies and dendrites. The result of a large amount of RNA in rough endoplasmic reticulum (RER) and free polyribosomes.
Axon - a single, large process that emerges from the nerve cell bodies at the axon hillock. Axons do not contain Nissl substance.
Dendrites - multiple processes extending from the nerve cell bodies that contain Nissl substance.
Glial Cells - the small nuclei found around the motor neurons are mostly glial cells.