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Morphological Modifications of Oocyte Vitelline Envelope from Bufo arenarum during Different Functional States
Author(s) -
MARIANO MARTA I.,
De MARTIN MARTA G.,
PISANO ARMANDO
Publication year - 1984
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1984.00033.x
Subject(s) - vitelline membrane , oviduct , oocyte , human fertilization , biology , perivitelline space , ultrastructure , anatomy , amphibian , bufo , sperm , polarity in embryogenesis , toad , microbiology and biotechnology , embryogenesis , botany , gastrulation , endocrinology , embryo , zona pellucida , ecology
The submicroscopic morphology of the vitelline envelope of Bufo arenarum's oocyte change significantly during the maturation and fertilization processes. The morphological changes are related to physiological activity in vivo and can be triggered in vitro by experimental procedures. It is our scope to present the ultrastructure differences of fascicular components of the vitelline envelope in coelomic, “pars recta” conditioned, oviductal, oviposited and fertilized oocytes. Our experimental results indicate that artificial “pars recta” treatment of coelomic oocytes arrange the fascicular components as those of oviposited oocyte, although differences still remain indicating that additional maturation processes take place while the egg pass througth the oviduct. Fertilized or activated oocytes which are refractary to sperm penetration, change the vitelline envelope fascicular components orientation giving a submicroscopical image quite different to those of none fertilized oocytes. These ultrastructural changes define in a clear cut manner the functional states of Bufo arenarum's oocyte.