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Urocortin 1-containing neurons in the human Edinger-Westphal nucleus
A E Ryabinin1, N O Tsivkovskaia, S A Ryabinin
1Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, 97239, USA. ryabinin@ohsu.edu
Abstract:
The topographical location of neurons containing urocortin 1, a peptide related to corticotropin-releasing factor was investigated in human postmortem brain by immunohistochemistry, and compared with the location of neurons containing choline acetyltransferase, a marker for cholinergic cells. A three-dimensional computer reconstruction of the urocortin 1 and choline acetyltransferase-positive population of neurons within the oculomotor area was made. It was shown that the urocortin 1-positive neurons are located within the area identified as the Edinger-Westphal nucleus according to the human brain stem atlas, and that the neurons identified as Edinger-Westphal nucleus in the atlas are not choline acetyltransferase-positive. This finding agrees with recent animal studies showing that urocortin 1-positive neurons are not identical with the parasympathetic cholinergic neurons projecting to the ciliary ganglion. They indicate that the neurons identified as Edinger-Westphal nucleus in the human brain stem atlas belong to the non-preganglionic Edinger-Westphal nucleus, whereas the location of preganglionic Edinger-Westphal nucleus remains unidentified.
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