Occurrence of an anterior spinal, cerebrospinal fluid-contacting, urotensin II neuronal system in various fish species - PubMed (original) (raw)
Comparative Study
Occurrence of an anterior spinal, cerebrospinal fluid-contacting, urotensin II neuronal system in various fish species
C R Yulis et al. Gen Comp Endocrinol. 1988 May.
Abstract
The occurrence of an "extraurophyseal" system of immunoreactive-urotensin II (IR-UII) neurons was determined by immunocytochemical studies in the central nervous system of different fresh- and seawater species of fish. The following general elements were identified as forming part of this system: (a) a midsagittal column of IR-UII neurons located ventral to the central canal, with dendrite-like processes projecting into the cerebrospinal fluid (CSF); (b) a medial plexus of fine beaded IR-UII fibers located ventral to the column of cell bodies; (c) a bilateral or midsagittal, probably ascending, longitudinal bundle of IR-UII beaded fibers varying in location from the ventral to the lateral funiculus; (d) putative IR-UII fiber endings along the ventrolateral surface of the spinal cord; (e) IR-UII fiber distributions (probably terminal) in the ventral horns of the spinal cord and in several brain regions. The occurrence of this system in all fishes examined and the morphological features of this IR-UII system linking the central canal CSF to several CNS regions, as well as to the periphery of the spinal cord, point to an important role for this CSF-contacting anterior spinal IR-UII system in fish.
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