Ovary

This tissue looks like a dying corpus luteum, but that is a rare event. This is an example of a structure that we cannot identify unless we see a zona pellucida and/or a glassy membrane. If you had a section along the plane labelled A you would not be able to differentiate between a section through the theca interna cells of a large atretic tertiary follicle and a dying corpus luteum. UCLA Histology Collection.