| Summary: | The aim of the paper is the morphometry of lymphoid aggregations of small intestine. The linear dimensions of small intestine peyer’s patches of white outbred male rats (quantity, length, width, the distance between them, diameter and length of small intestines, surface area of peyer’s patches and inner surface of small intestine) in different age groups have been investigated. Changes in quantity of rats’ lymphoid tissue in small intestine depend on activity of peripheral organs of immune system in different age periods. The length, diameter and area of internal surface of small intestine are in direct proportion to the mass of the animal. The distance between Payer's patches depends inversely on the quantity of the patches in all the age groups of animals. The number and sizes of Payer's patches increase and reach their maximum in experimental rats of the third group. The least size of Payer's patches is observed in animals of the fifth group.
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