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.
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Last updated: 7 February 2008 / dgk