الفهرس 
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Abstract
The fundamental aim of this investigation was to elucidate the histological and the electron microscpoical structure of four types of the hypophyseal cells including folliculotrophs, luleotrophs, iactotrophs and thyrotrophs and their relation to the histomorphological and electron microscopical changes in the corresponding ovaries and endometria.
Our study has been carried out on seventy eight female albino rats (Ratlus norvegcus albinos) classified into three ages; immature, mature and senile. The mature rats were subdivided into five groups according to different phases of the estrous cycle that is to say early proestrus, late proestrus, estrus, metestrus and diestrus. The collected specimens (pars distalis, ovaries & uteri) were embedded in paraffin, serially and stepserially sectioned at 4-6 micrometers thick and stained with some histological and histochemical dyes to be prepared for light microscopical examination. Some.specimens were, also, treated to be examined by the electron microscope.
The pars distalis was surrounded by a thin delicate fibrous capsule and contained fine interstitial tissue in immature ages. They were increased in thickness and density with advancing ages. Folliculotrophs couldn’t be differentiated from luteotrophs up to the 2nd week of neonatal rats. They were stained similarly. The cells were located peripherally in a small- sized PAS +ve area (sex zone) which became enlarged with advanced ages. The differentiation was noticed in 22- day- old rats. As the folliculotrophs were polymorphic in shape and contained numerous polymorphic secretory granules stained purplish - violet, the luteotrophs were PAS+ ve oval or irregular cells containing uniform secretory.