[Cytological structure of the thymus gland in mature monkeys]

Histological sections of the thymus were studied morphometrically in 5 rhesus monkeys and 3 hamadryas baboons. The ratio of square surfaces of the cortical and cerebral substance, the percentage of Hassall's corpuscles and cellular elements (lymphocytes, stromal elements, blasts etc.) were established in the organ. Individual and species peculiarities of the structure of thymus elements were found. Less amount of parenchyma and growth of the stroma in baboons and a greater mitotic complex in rhesus monkeys show more pronounced involution processes in baboons.