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Atretic follicle in the ovary of a pigeon (HE)
Not all follicles ovulate. Sometimes the oocyte degenerates after which the remaining follicle wall atrophies. As in mammals, this atresia can happen in different manners.
The micrograph above shows a form of atresia in which the wall of the follicle gets thickened by proliferation of the stratum granulosum.