[Dynamics of the structural transformations of the microcirculatory bed of growing and atretic ovarian follicles]

Synchronized populations of growing and atretic cavitary follicles in the ovaries of prepubertal mice were produced by administration of serum gonadotropin. Light and electron microscopy with the use of morphometric analysis revealed a definite correlation between the size of the follicles and their vascularization in the course of growth and atresia. The evidence obtained suggests the leading role of the microcirculatory bed initiation of atresia.