Primordial follicles are the least developed follicles in the ovary. They consist of a primary oocyte and a single layer of flattened follicular cells.
Wiley, M. Ovary, Primordial Follicles. Digital Laboratory Medicine Library, Dept of Laboratory Medicine & Pathobiology, University of Toronto. Published
. Accessed December 17, 2025. https://dev.dlml.cflabs.ca/image/ovary-primordial-follicles-lmp14653-02-0