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HORMONAL CONTROL OF OOCYTE MATURATION IN ARENICOLA MARINA L. (ANNELIDA, POLYCHAETA) I. MORPHOLOGICAL STUDY OF OOCYTE MATURATION
Author(s) -
MEIJER L.
Publication year - 1979
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.1979.00303.x
Subject(s) - germinal vesicle , arenicola , oocyte , meiosis , prophase , biology , human fertilization , microbiology and biotechnology , in vitro maturation , metaphase , cytoplasm , cortical granule , botany , andrology , anatomy , embryo , chromosome , ecology , genetics , medicine , gene
In Arenicola marina (Annelida, Polychaeta) the oocytes are arrested in the first prophase stage of mciosis until spawning. Oocyte maturation is under hormonal control: when incubated in vitro in a brain extract oocytes reach the first metaphase at which they remain arrested until fertilization. The meiosis reinitiating substance induces numerous morphological changes in the oocytes: general (shape), cortical (microvilli retraction, plasma membrane flattening), cytoplasmic (cortical granules repartition) and nuclear modifications (germinal vesicle breakdown, chromosome condensation, formation of a meiotic maturation spindle). A kinetic study of these morphological modifications has been performed.