[The origin and transport of chylomicrons in enterocytes in chickens]

After peroral administration of sunflower oil to chick old 14 to 23 days, the rise and passage of chylomicrons were studied electronoptically in the enterocytes of the small intestine. Enterocytes resynthetize the absorbed monoglycerides and fatty acids into neutral fat in the profiles of smooth endoplasmic reticulum and in multivesicular corpuscles in the form of chylomicrons and loose cytoplasmic fat drops in their apical part. The finishing and transport of chylomicrons in the enterocyte are the result of the activity of granular endoplasmic reticulum and the Golgi apparatus. Exocytose carries chylomicrons from enterocytes to intercellular space of the epithelium from where they pass the basal membrane of the epithelium and then, carried by pinocytose, they pass into the lumen of the blood and chyle capillaries. No morphological manifestations of fat absorption in the other cell types of intestinal epithelium (goblet cells, argyrophil cells and intraepithelial lymphocytes) were demonstrated.