Open AccessSTRUCTURE OF EXCRETORY DUCTS OF EXTRAAND INFRAORBITAL GLAND OF LABORATORY RATS
Author(s) -
Андрій Любославович Каценко
Publication year - 2021
Publication title -
aktualʹnì problemi sučasnoï medicini: vìsnik ukraïnsʹkoï medičnoï stomatologìčnoï akademì
Language(s) - English
Resource type - Journals
eISSN - 2077-1126
pISSN - 2077-1096
DOI - 10.31718/2077-1096.21.4.144
Subject(s) - excretory system , lacrimal gland , anatomy , connective tissue , pathology , biology , duct (anatomy) , capsule , medicine , botany
The aim of the study. To find out and compare the structure of the excretory ducts of the extraand infraorbital lacrimal gland of the laboratory rat. Object and methods. Five male laboratory rats were examined by dissecting the lacrimal glands, from which a series of thin paraffin sections were obtained for histological examination. Micropreparations were stained with hematoxylin and eosin and examined under a light microscope. Results. It was found that the tubular-alveolar epithelial components of the extraorbital gland of rats inside the lobe are even denser than in the infraorbital gland, as evidenced by very narrow interstitial fissures. The lacrimal glands of laboratory rats have an individual well-defined connective tissue capsule. Inside and between the lobes there are slit-like interpithelial interstitial spaces, in which we do not detect an accumulation of lipocytes, as occurs in the lacrimal glands of man. In the volume of lobes such as the extraorbital and infraorbital glands, the interpithelial interstitial spaces contain vessels of the hemicrocirculatory tract, mainly capillaries, precapillary arterioles and postcapillary venules. Arterioles and venules are usually visualized outside the lobes in more pronounced interstitial spaces. Conclusions. 1. The epithelial tubular structures of the lacrimal gland of the laboratory rat form a complex-branched system of excretory ducts, in which there are no typical intercalated ducts, which would be the connecting component between the terminal section and the excretory duct system. 2. The absence of intercalated ducts leads to a change in the appearance on histological specimens of tubulo-acinar aggregates of the lacrimal glands of rats in favor of tubuloalveolar assemblages. 3. Among the excretory ducts of the lacrimal glands of the laboratory rat, the following can be distinguished: intra-lobular, lobular and common excretory ducts, through which the secret is produced. The common ducts of the extraand infraorbital lacrimal glands, as a rule, combine to form their common duct.