Bovine cumulus-corona cells in maturing oocytes. a scanning electron microscopic study
Verlengia, C.; Nottola, S.A.; Bellachioma, E.; Casilli, F.; Tripodi, A.; Familiari, G.
Italian Journal of Anatomy and Embryology 103(4 Suppl 1: 119-127
1998
ISSN/ISBN: 1122-6714 PMID: 11315943 Document Number: 484123
The ultrastructural features of cumulus-corona cells surrounding maturing oocytes in bovine were studied by means of scanning electron microscope in order to provide a detailed description of their surface changes during oocyte maturation. Cumulus corona cell complexes of immature oocytes showed a compact aspect with narrow intercellular spaces. The spaces around mature oocytes enlarged because they were progressively filled with abundant microfibrillar extracellular matrix. In cumulus corona cells complexes of immature oocytes very numerous long and filiform microvilli were observed, whereas the cumulus corona cell surface surrounding mature oocytes showed occasional large cytoplasmic protrusions along with scanty microvilli and numerous blebs.