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Ovarian Follicle
Atretic Follicle; Ovarian Follicles; Atretic Follicles; Follicle, Atretic; Follicle, Graafian; Follicle, Ovarian; Follicles, Atretic; Follicles, Graafian; Follicles, Ovarian; Graafian Follicles
An OOCYTE-containing structure in the cortex of the OVARY. The oocyte is enclosed by a layer of GRANULOSA CELLS providing a nourishing microenvironment (FOLLICULAR FLUID). The number and size of follicles vary depending on the age and reproductive state of the female. The growing follicles are divided into five stages: primary, secondary, tertiary, Graafian, and atretic. Follicular growth and steroidogenesis depend on the presence of GONADOTROPINS.