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Nabela M.S. Al-Shatter, ZohairI.F.Rahemo
Department of Biology, College of Science, University of Mosul,
DOI: https://doi.org/10.17656/jzs.10334
Abstract:
Two freshwater fish models were selected, to study their caudal neurosecretory
system, caught in river Tigris passing through Neinava province. A total of 45
Carasobarbus luteus and 32 of , Capoeta trutta were examined to study their caudal
neurosecretory system of gross morphological and histological aspects. The caudal
spinal cord in B. luteus is a lobulted organ, possesses (3-5) lobules which are oval or
ovoid, each lobule measures (450-675) μm and average diameter is (270) μm, situated in
postero-ventral part of the spinal cord in the caudal region at the level of the last 5th
vertebrate, while spinal cord in C. trutta lacks these lobules. The caudal spinal cord
posseses three types of neurosecretory cells which appeared, after staining by three
different stains. These cells are situated at ventro- and ventro-lateral region of spinal
cord with respect to the central canal. These cells can be classified into three types,
small, median, and large cells.Noteworthy, Dahlgren cells are associated with blood
capillaries and it is easy to trace these cells with bulbous axons rich in secretary
materials as a large amount of neurosecretory material deposited in them. Furthermore,
neurosecretory material were deposited in the ventral part of the spinal cord which are
known as Herring bodies, and blood vessels were observed near them, some axons of
Dahlgren cells seen directed toward the blood capillaries
Keywords: fishes, urophysis, histology
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