STRUCTURAL ORGANIZATION OF THE GLANDULAR COMPONENTS OF THE EXTRAORBITAL AND INFRAORBITAL LACRIMAL GLANDS OF THE LABORATORY RAT

Katsenko A. L., Sherstyuk O. О., Litovka V. V., Svintsytska N. L.

MORPHOLOGY

Scentific article

Aim of the study. The aim of this work was to study and compare the morphological features of the extraorbital and infraorbital component of the lacrimal glands, as well as to study the morphological and functional characteristics of the tear ducts during their normal functioning. In ophthalmic practice, diseases of the lacrimal glands are quite common, however, their structure has not been sufficiently studied, especially for the lobular structure of both the extraand infraorbital lacrimal glands. Therefore, the purpose of this work is to study and compare the morphological features of the extra orbital and infraorbital components of the lacrimal glands. And also the study of the morpho-functional characteristics of the lacrimal ducts during the normal functioning of the lacrimal glands. Object and methods. In order to study the structure of the lacrimal gland of the rats, it was necessary to collect the material. We obtained from 10 laboratory rats of males by preparation on each side of 2 tears and one Garderova gland, only 60 biopsies. A series of thin paraffin sections were made for histological examination. The micropreparations were stained with hematoxylin and eosin and examined under a light microscope. Resuts. It was found that the tubular-alveolar epithelial components of the infraorbital gland of rats within the lobule are located even more densely than in the extra-orbital gland, as evidenced by very narrow interstitial gaps. The lacrimal glands of laboratory rats have an individual well-defined connective tissue capsule. within and between the lobules have slit-like interpithelial interstitial spaces, in which we do not detect the accumulation of lipocytes, as it is in the human lacrimal glands. In the volume of the lobes, both extra-orbital and infraorbital gland, the interpithelial interstitial spaces contain vessels of the hemmicrocirculatory bed, mainly capillaries, precapillary arterioles, and postcapillary venules. Arterioles and venules are usually visualized outside the lobes in more pronounced interstitial intervals, which are located between 3-4 adjacent lobes. Conclusions. Visually in the lobes of the infraorbital gland, in comparison with the extraorbital lacrimal gland of rats, the secretory epithelial components are located very close to each other. Prospects for further research. It is planned to find the minimum level of structure of lacrimal glands of laboratory rats, which would correspond to the concept of structural-functional unit, based on the study and analysis of successive series of histological sections of both lacrimal glands, graphic and plastic reconstructions, morphometry data of excretory duct systems and HMCR units. Similar issues will be addressed in the study of the Gardera gland of a laboratory rat.

lacrimal gland, morphology, extraorbital, infraorbital fate.

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«Bulletin of problems biology and medicine» Issue 2 (156), 2020 year, 259-262 pages, index UDK 617.764.1-008.8:599.323.4

10.29254/2077-4214-2020-2-156-259-262