الفهرس 
The parotid glandOnly 14 pages are availabe for public view
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Abstract
) This work was done aiming firstly to study the prenatal developmentand the changes in the lymphoid organs in response to aging.The study was done on the thymus, as one of the central lymphoidorgans, the spleen and the cervicallymph nodes as peripheral
Secondly, to study the changes which would result in these organs under the effect of two major immunosuppressive drugs cyclophosphamideand corticosteroids) which were commonly used in thetreatment of neoplastic and auto-immune diseases beside many otherindications. Doses equivalent to the human therapeutic ones were
usedin the present study. Two hundred and eighty albino rats of both sexes and of erent ages were used in the present work. Fourteen adult pregnant
ales and five adult males were used to give embryos to study natal developmental changes. On the other hand, seventy three rats sifledinto six groups according to the age (3days, 10 days, 20 days, days, adult age and old age) and were used to study the postnatal
lopment of the lymphoid organs. In the experimental study, seventy healthy adult male albino with average weight 200 grams were classilled into two major ups. GroupAto study the effects of cyclophosphamide and group