Journal article

Publication year: 1977

Pages: 147-162

Journal: Protoplasma

Volume number: 92

Issue number: 1-2

ISSN: 0033-183X

eISSN: 1615-6102

DOI Link: https://doi.org/10.1007/BF01280207

Publisher: Springer

Abstract: 
The oocytes of the minnow P. phoxinus were examined by light microscopy and EM. In stage I they are only enveloped by the primary oocyte membrane which extends microvilli towards the follicle epithelium. The development of the actual egg envelope, the cortex radiatus, starts early in stage II. The cortex radiatus differentiates soon into the cortex radiatus externus and the cortex radiatus internus. In the course of this development, the externus is formed earlier than the internus. The differentiation of the cortex layers is finished about the end of stage III. The exterior and structur of the cortex radiatus externus of the minnow differs widely from the scheme found at other cyprinid oocytes. The Phoxinus egg envelopes resemble more those of salmonids. The development of cortical alveoli takes place simultaneously in the oocytes beyond the primary oocyte membrane. They expand centripetally. The cortical alveoli of P. phoxinus probably derive for the most part from fusion of vesicles.

Harvard Citation style: RIEHL, R. and SCHULTE, E. (1977) LIGHT AND ELECTRON-MICROSCOPIC STUDIES OF ENVELOPES IN EGG CELLS OF MINNOW (PHOXINUS-PHOXINUS [L] - TELEOSTEL-CYPRINIDAE), Protoplasma, 92(1-2), pp. 147-162. https://doi.org/10.1007/BF01280207

APA Citation style: RIEHL, R., & SCHULTE, E. (1977). LIGHT AND ELECTRON-MICROSCOPIC STUDIES OF ENVELOPES IN EGG CELLS OF MINNOW (PHOXINUS-PHOXINUS [L] - TELEOSTEL-CYPRINIDAE). Protoplasma. 92(1-2), 147-162. https://doi.org/10.1007/BF01280207