Elektronenoptische Untersuchungen über die feinstruktur des ovarialeies und des Follikelepithels von Amphibien

Wartenberg, H.; Gusek, W

doi:10.1016/0014-4827(60)90001-x

Cited by 27 publications

(7 citation statements)

References 5 publications

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“…The criteria for dividing oocytes into many stages are mainly based on the size, the amount and the distribution of yolk and pigment, 2,3,6 and the morphology of chromosomes. 21 In the present study, we used several criteria for characterizing the developing oocytes of R. tigerina.…”

Section: Disscussionmentioning

confidence: 99%

“…Detailed studies on the morphological changes in the oocyte cytoplasm, the oocyte-follicle cell relationships and the process of vitellogenesis have been carried out in R. esculenta, 6 R. pipiens, 7 Triturus viridescens 8 and X. laevis. 9,10 By comparison in R. tigerina there is still a lack of information on the ultrastructure of developing oocytes.…”

Section: Introductionmentioning

confidence: 99%

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Sretarugsa¹,

Weerachatyanukul²,

Chavadej³

et al. 2001

ScienceAsia

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Developing oocytes in adult Rana tigerina can be divided into six stages based on size, color and histology. The stage I oocyte (50-350 µm) is characterized by translucent cytoplasm and a smooth nuclear membrane. The major portion of its cytoplasm contains a large quantity of free ribosomes. Cytoplasmic organelles confined to the peripheral part of oocyte include a few mitochondria, Golgi apparatus, primary and secondary lysosomes, and a few lipid droplets. The stage II oocyte (360-550 µm) contains alcian-blue positive cortical alveoli at the periphery and large central nucleoli in the nucleus. The stage III oocyte (560-900 µm) is characterized by the deposition of yolk platelets and formation of pigmented granules. The cortical alveoli are greatly increased in number as well as in size. Endocytotic activity on the surface of oocyte can be observed. The stage IV oocyte (910-1300 µm) is characterized by a large number of main yolk bodies, cortical alveoli and melanin granules. High endocytotic activities are observed. In the stage V oocyte (1310-1500 µm), most of the melanin granules migrate to the animal pole, while the cortical granules are concentrated underneath the oolemma. The stage VI or fully grown oocyte (1510-1700 µm) is characterized by a complete absence of melanin granules in the vegetal pole and by the cessation of endocytotic activity. Studying the development of ovaries in frogs at various ages reveals that definitive ovaries are formed in the one-month-old frog. Ovaries of two-to four-month-old frogs contain only stage I oocytes, while the ovaries of twelve-monthold frogs contain oocytes of all stages, which indicate the maturity of female frogs. Studying the seasonal variation of ovaries throughout the year reveals that there are no stage VI oocytes in ovaries collected from November to February, while these oocytes are present during the period from March to October.

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Section: Disscussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Untitled

Sretarugsa¹,

Weerachatyanukul²,

Chavadej³

et al. 2001

ScienceAsia

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“…The ultrastructure of the follicular epithelium in vertebrate ovarian follicles has been studied by many investigators (for review article, NOrrevang, 1968). Early reports dealing with mammals were published by Yamada et al (1957), Chiquoine (1959), Sotelo and Porter (1959), Anderson and Beams (1960) and Wartenberg and Gusek (1960). A paper by Press (1959) deals with birds and these by Kemp (1956) and Wischnitzer (1957) deal with amphibians.…”

Section: Introductionmentioning

confidence: 99%

Fine Structure of Micropylar Cell in the Ovarian Follicle of the Teleost, Plecoglossus altivelis.

Yasuzumi

Imura

Okura

et al. 1983

Okajimas Folia Anatomica Japonica

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“…Numerous studies have been directed toward cytoplasmic differentiation of the amphibian egg (Kemp, 1953(Kemp, , 1956Wartenberg and Gusek, 1960 ;Wartenberg and Schmidt, 1961 ;Balinsky and Devis, 1963 ;Wischnitzer, 1966) . One of the egg's components is a THE JOURNAL OF CELL Biozoor • VOLUME 52, 1972 • pages 493-501 pigment granule, presumably containing melanin, which is synthesized and deposited within an organelles (melanosome ; see Fitzpatrick et al ., 1966 for terminology) during oocyte development .…”

Section: Introductionmentioning

confidence: 99%