RESUMO
The somatotrophic and thyrotrophic cells were originally developed in the adenohypophysis from undifferentiated chromophobic cells at the foetal age of 4-8 weeks. The follicle-stimulating hormone cells appeared at a foetal age of 24-28 weeks. Prolactin and luteinizing hormone cells were first seen at of foetal age levels of 32-36 and 40 weeks. The germinal epithelium of flattened and cuboidal cells in the ovary was changed to cubical and columnar types, 24-28 weeks of foetal age. The sex cords appeared at 8-12 weeks of foetal age. The primary and secondary follicles were observed at 8-12 and 20-24 weeks of foetal age, respectively. Follicular cavity was noticed at 32-36 weeks, while large follicles encapsulated by follicular sheath were seen in the 40th week of foetal age. Some ovarian follicles degenerated during or after their development. Surface epithelium in the uterus changed from cubical to columnar type at 8-12 weeks of foetal age. The endometrium was clearly distinguished from the myometrium at 16-20 weeks of foetal age. The uterine glands appeared at 16-20 weeks as short and straight tubular glands, and they began to branch in the 40th week of foetal age.
