Follicular Layer of Oocytes of Micropercops swinhonis (Pisces: Perciformes)

(zona radiata) covering the oocyte in this species. Therefore, the purpose of the present study is to describe the developmental features and the In the goby Micropercops swinhonis , the follicular layer of full -- grown oocytes consists of an outer layer (theca cell) and an inner layer (granulosa cell). As the oocyte grows, columnar cells of inner granulosa layer secrete mucin to their cytoplasm and then surround the oocyte. Such granulosa cells appear to be cuboidal cells in the early vitellogenesis, yolk vesicle stage, to be replaced by columnar cell secreting mucins (adhesive materials) in the middle vitellogenesis, yolk granule stage. The enveloping layer of the oocyte has a muco -- follicle layer filled with mucins. The mucins are an amorphous and electron -- dense substance. Interestingly, the oocyte enveloping layer becomes thickened towards the animal pole as vitelogenesis proceeds. A zona radiata of about 7.8 ~~ 11.5 µµ m thick is present below the muco -- follicle layer. The zona radiata is composed of an one -- layered electron --dense externa and a three to five -- layered electron -- less interna.

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