Nervous tissue, ventral horn of spinal cord
Arrows on this image of spinal cord indicate blood vessels. The smallest vessels, including capillaries, are not noticeable at this magnification.
Note that a clear "halo" commonly appears around blood vessels (and also around cell bodies).
This an artifact of histological preparation, resulting from tissue shrinkage when the central nervous tissue is fixed.
Comments and questions: dgking@siu.edu
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https://histology.siu.edu/ssb/NM043b.htm
Last updated: 13 August 2021 / dgk