MORPHOLOGY AND HISTOLOGY OF Y ORGAN IN RELATION TO GROWTH AND REPRODUCTION IN THE FRESHWATER CRAB BARYTELPHUSA CUNICULARIS
Journal Title: Academic Research International - Year 2018, Vol 9, Issue 3
Abstract
This study aims to determine the morphological and histological changes of Y organ in relation to growth and reproduction in the female freshwater crab Barytelphusa cunicularis. The Y organs are ectodermally derived, lobulated endocrine glands entrenched in a brown fatty tissue in the cephalothoracic region and consisted of a network of lobules interconnected by many blood sinuses and capillaries. The gland contained two cell types: type I and type II and exhibited remarkable changes in gross morphology and histology in relation to growth and reproduction. The organ was very small and composed of only type I cells at stage I. Both the cell types and hemal sinuses were evident in the organ of stage II crabs. Type II cells with increased cytoplasmic volume and prominent blood sinuses and capillaries were characteristic of Y organ of stage III crabs. Large lobules with compactly packed type II cells were observed in stage IV. The organ displayed substantial differences in morphology and histology in relation to various phases of oogenesis, with least level of activity during avitellogenic and late vitellogenic phases and maximum activity during early and middle phases of vitellogenesis. During early vitellogenic phase, the organ exhibited type I cell proliferation. Large lobules with total elimination of intra and interlobular spaces and rich vascularization were the important features of the gland during middle phase of vitellogenesis. The gland has a vacuolated appearance showing signs of degeneration in late vitellogenic phase. To conclude, the Y organ of female B. cunicularis demonstrated discernible changes in morphology and histology in relation to various developmental stages and vitellogenic phases, indicating its role in growth and reproduction. Further research is yet to be carried out on ultrastructural profiles of the gland during various developmental and vitellogenic phases.
Authors and Affiliations
Navya Gopal, Arath Raghavan Sudha Devi
Keywords
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