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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 6 - Nervous Tissue

Plate 6.89 Lower Motor Neuron

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed

Spinal cord ventral horn

Plate 6.89 Lower Motor Neuron

Rhesus monkey, 10% formalin, Glees' method, 612 x.

Perikaryon: It is multipolar (i.e., possesses a single axon and several dendrites) and has a central prominent nucleus. Cytoplasm is rich in Nissl* bodies except at the axon hillock (lighter area of cell body from which axon arises). Nissl bodies can be seen in Plates 1 and 90.

Dendrites: Stout tapering processes similar in structure to the perikaryon.

Axon: This arises from the axon hillock. It is a slender process of uniform diameter and great length. The myelin sheath is not seen around the axon in this preparation because it is not preserved by the fixation method used.

*Nissl was a nineteenth-century German neurologist.

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Anatomy Atlases is curated by Michael P. D'Alessandro, M.D. and Ronald A. Bergman, Ph.D.

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