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KMID : 0378019720150010117
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New Medical Journal
1972 Volume.15 No. 1 p.117 ~ p.122
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The histological and the histichemical studies on the virellogenesis of the mwal worm, Martianus dermestoides.
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Park Tae-Kyu
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Abstract
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Studying the ovary and the oocyte during the vitellogenesis of Martianus dermestoides by the histolo gical and histochemical methods, the auther obtained the following results:
(1) The pair of ovary is place at the dorsal of the abdomen and each ovary consists of 8-10 telotrophic ovarioles.
(2) Each ovarioles is divided into the four parts of the terminal filament, the germarium, the vitellarium and the pedicel from the tip downwards. And the oocytes in the vitellarium are classified into six types according to its size and the characteristics of their surrounding follicle cells.
Stage 1. Oocytes are the youngest and are embedded in the prefollicular tissue which is not yet differentiated.
Stage 2, 3. Oocytes are surrounded by the multi-layer of the columnar follicle cells and the trophic cord attached each oocyte to the trophic core.
Stage 4, 5, 6, Oocytes are the matured egg which is surrounded by simple follicular epithelium and the chorion is formed.
(3) In general, the process of the oogenesis in the meal worm may quite be resembled to the other telotrophic ovarioles. And the difference is as followed. The trophic tissue consists of non-cellular substance which the clusters of the trophic nuclei., are situated in telotrophic ovariole. But in the telotrophic ovary of Martianus dermestoides, the trophic tissue retains its cellular characters.
(4) The yolk of the early oocytes. stage 1 & 2 largely contains protein, fatty acid and RNA which are transported to the oocyte by the trophic cord from the trophic tissue.
(5) At stage 3, finely granulated polysaccharide. PAS positive zone appears in the oocytic cytoplasm adjacent to the follicular epithelium and it dispersed to the oocyte in the later stage.
(6) The polysaccharide is not glycogen but mucopolysaccharide because it resits to saliva extraction.
(7) The protein is presented in all the proccess of the process of the egg formation. In the ea?Ily stage, it is a homogeneous but a granular in the oocyte of the stage 3. It may be cotain the tyrosine.
(8) The fatty acid of the lipid is supplied from the trophic cell. The neutral fat, the phospholipid, the triglyceride as the unstaturated lipid, and the cholesterol which are formed from the follicle cell,
is presented in the oocyte of the stage 3 & 4 of the egg formation. But in the matured egg,., only `the neutral fat is remmained.
-(9)--The-DNA is presented in the nuclear of the undifferentiated cell, the oocyte, trophic cell and the follicle cell in the germarium. Particularly, the RNA is found plentiful in the cytoplasm of the trophic cell, the differentiated follicle cell and the early oocytic cytoplasm.
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