Reproduction: Cells of the Ovary and Testis

At 40X, micrograph width = 2 mm; at 100X, micrograph width = 0.8 mm; at 400X, micrograph width = 0.2 mm; at 1000X, micrograph width = 0.08 mm.

The cells of the ovary of a cat.
Note that a follicle is visible with an oocyte inside it.

The cells of the testis of a dog.
Note that the sperm are visible within the lumen of the seminiferous tubules.