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A Nissl body (or Nissl granule or tigroid body) is a large granular body found in neurons. It was named after Franz Nissl, German neurologist (1860-1919).
Nissl bodies can be demonstrated by a method of selective staining developed by Nissl (Nissl staining), using an aniline stain to label extranuclear RNA granules. This staining method is useful to localize the perikaryon, as it can be seen in the soma and dendrites of neurons, though not in the axon or axon hillock. RNA stains blue with this method due to its basophilic (lat. "base-loving") properties.
These granules are rough endoplasmic reticulum (with ribosomes) and are the site of protein synthesis.
Nissl bodies show changes under various physiological conditions and in pathological conditions they may dissolve and disappear (karyolysis).
See also
External links
- MeSH Nissl+Bodies
- synd/2902 at Who Named It
- Histology at BU 04103loa - "Nervous Tissue and Neuromuscular Junction: spinal cord, cell bodies of anterior horn cells"
- Anatomy at MUN nerve/nerve97 (halfway down page)
- Histology at anhb.uwa.edu.au
- Tissues containing Nissl bodies at harvard.edu
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