| 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: | cortical granule |
|---|---|
| Synonyms: | cortical vesicle |
| Definition: | A secretory vesicle that is stored under the cell membrane of an egg. These vesicles fuse with the egg plasma membrane as part of egg activation and are part of the block to polyspermy. |
| Ontology: | GO: Cellular Component [GO:0060473] QuickGO AmiGO |