Aim: In this study, histological changes in stomach during prenatal and postnatal development were examined.
Material and Methods: In this study, 34 female Wistar Albino rats weighing 200-250 g, obtained from Inonu University Experimental Animal Research Lab were used. Stomach samples obtained from prenatal 7,10,14,17, 20 days old fetuses and from postnatal 5,10,15,20 days old newly born and young adult rats were prepared by routine tissue proceeding procedure and examined by light microscopy.
Results: In prenatal period, the stomachs of 7, 10,14 days old rats were surrounded by stratified columnar or pseudostratified columnar epithelium. Mesenchymal connective tissue surrounded the epithelium. A circular oriented muscle layer was formed in mesenchyme in prenatal 17 days old rats. In prenatal 20 days old rats, extension of the lumen, thickening of the wall, appearance of the foveola and gland-like structures were observed. Epithelium was transformed into simple columnar epithelium in various places. Mucous neck cells in the gland epithelium and outermost serosa layer were identified. On postnatal 5th day, parietal and chief cells could be detected in tubular gastric glands. Myenteric plexus was observed between two muscle layers. On postnatal 10th day, mucus layer was observed on the surface. In subsequent periods, histological properties of stomach were changed and gained adult stomach’s properties.
Results: It was investigated in which prenatal and postnatal periods the histological features of the stomach of an adult rat were acquired. The obtained data of this study will guide the other related studies.
Key Words: Stomach; Prenatal; Postnatal; Development.
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