| Name: | oocyte stage II |
|---|---|
| Synonyms: | cortical-alveolar oocyte, oocytes stage II, previtellogenic oocyte, Stage 2 oocyte |
| Definition: | Oocyte part of stage II ovarian follicle. The stage II oocytes are characterized by the presence of cortical alveoli, a tripartite zona radiata (vitelline envelope), and a central germinal vesicle. |
| Ontology: | Anatomy Ontology [ZFA:0001565] |
| Name: | chorion micropyle formation |
|---|---|
| Synonyms: | |
| Definition: | Establishment of the micropyle, a single cone-shaped specialization of the chorion that allows sperm entry into the egg prior to fertilization. |
| Ontology: | GO: Biological Process [GO:0046844] QuickGO AmiGO |