The caudal neurosecretory system of the teleostean Clupea melanostoma |
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Authors: | Federico GarcÍa Romeu Celia G de Pascar |
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Institution: | (1) Laboratorio de Ictiofisiologia, Museo de la Plata, La Plata, Argentina |
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Abstract: | Summary The caudal neurosecretory system of Clupea melanostoma is described. The urophyseal area in this species is merely a spinal cord enlargement divided into two distinct zones: a ventral and ventrolateral vascular zone where neurosecretory material is concentrated, and a dorsal cell-rich area where the perikarya of the neurosecretory cells are found.The hypothesis is advanced that the first-named vascular area has developed into the more differentiated urophysis of the less primitive teleosts while the dorsal cell-rich area has become part of the filum terminale. Two main types of neurosecretory cells are described.This work was supported by grant L 96 Z from the Consejo Nacional de Investigaciones Cientificas y Técnicas. |
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