The Caudal Urophysis of Carasobarbus luteus and Capoeta trutta caught from river Tigris passing through Mosul city

Volume 16 , Issue 1 , October 2014 , Pages 315-321

Authors

¹ Department of Biology, College of Science, University of Mosul,

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

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