Figure 223

Primordial follicle, a. Schematic drawing of a primordial follicle shows the oocyte arrested in prophase of the first meiotic division. The oocyte is closely surrounded by a single layer of squamous follicle cells. The outer surface of these cells is separated from the connective tissue by a basal lamina. The ooplasm contains characteristic organelles, as seen with the electron microscope, including a Balbiani body, annulate lamellae, and small spherical mitochondria.

Balbiani body a

follicle cells basal lamina rER stromal annulate lamellae mitochondrion

Balbiani body a

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