| Popis: |
As demonstrate serial semithin sections and transmissive electron microscopy, there is not one but a group (2-7) of lymphatic capillaries with anastomoses between them in the villus of the white rat jejunum. In the superior parts of the villus the lumen in the lymphatic capillaries is maximal, and their distance to the epithelial basal membrane of the anterior and posterior surfaces is small. In the inferior part of the villus, when the size of the lumen in the lymphatic microvessels is minimal, the greatest distance between them and the basal membrane of epithelium covering the mentioned surfaces of the villus is noted. In the superior and middle parts of the villus paracellular transport of lipids from the interstitial space into the lumen of the lymphatic capillaries predominate, in the inferior part--transcellular is the main way of transport. The topographic peculiarities of the lymphatic microvessels in the superior and middle parts of the villus make, in combination with the active paracellular transport, the morphological basis of a more intensive absorbtion of lipids from the intestinal lumen. |
