[Scanning microscopy of the early stages of embryonic development of baboons (Papio cynocephalus): oocyte, penetration of the zona pellucida, and morula].
The surface of ovarian oocytes is evenly covered with finger-like microvilli about 1 micron long. Penetration of capcitated spermatozoa in the zona pellucida apparently occurs after acrosome reaction and though a narrow slitmmorulae are constituted of rounded blastomeres, usually of similar size and microvillous covering. A few blastomeres may be smaller than others, probably as a result of faster mitotic rate in one of the blastomeres compared to adjacent ones. Microvilli are numerous in the interblastomeric furrows where junctional ridges are not observed at the 30-40 cell stage.
D000818:Animals; D005260:Female; D005306:Fertilization; D000882:Haplorhini; D008297:Male; D008855:Microscopy, Electron, Scanning; D009865:Oocytes / Q000648:ultrastructure*; D010063:Ovum / Q000648:ultrastructure*; D010215:Papio / Q000196:embryology*; D013084:Sperm-Ovum Interactions; D015044:Zona Pellucida / Q000648:ultrastructure; D015053:Zygote / Q000648:ultrastructure*
Observation par microscopie à balayage de stades précoces du développement embryonnaire chez le Babouin (Papio cynocephalus): ovocyte, pénétration de la zone pellucide et morula