Mammal, bovine ovary (LM, Medium)

Structure List Ovum Corona radiata Cumulus oophorus Antrum Basement membrane Theca interna Theca externa Artifact (fold in tissue) Low Magnification View

The antrum is a fluid-filled space which begins as a number of small spaces between the granulosa cells. As the several spaces unite into a single fluid-filled chamber, the oocyte remains on a mound of granulosa cells, the cumulus oophorus, to one side of the follicle.