Ovarian Development of House Fly (Musca domestica L.) (Diptera: Muscidae)

The ovarian development of Musca domestica, was examined under light microscope. There are two ovaries in the adult female of fly. Each ovary was formed of about 60-70 polytrophic ovarioles. The ovariole in cross sections organized in several circles. From cytological observations, ovary development and oogenesis could be divided in to 6 stages; ovaries with no noticeable follicle cells existing were characterized as (stage1), the follicle-growing stages considered as (stage2, 3), the vitellogenen in stages (stages4, 5(and mature egg stage (stage6). The oocyte initiated development at first stages of oogenesis; the nurse cells and follicle epithelial cells were considered to fulfill important functions with regard to the growth of the oocyte