Primary follicles develop from the primordial follicles. In the primary follicles, the cells surrounding the oocyte are now cubic and are called granulosa cells.
However, the oocyte that makes up the primary follicle will also have increased in size.
By Silvia Azaña Gutiérrez B.Sc., M.Sc. (embryologist) and Cristina Algarra Goosman B.Sc., M.Sc. (psychologist).
Last Update: 01/19/2022