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Fig. 5. Light microscopy and transmission electron microscopy of the duodenal
mucosa epithelium of digesting caimans. Enterocytes are filled with lipid
droplets and arranged as a single layered high prismatic epithelium. (A) Low
power light micrograph of a villus showing the typical arrangement of lipid
filled enterocytes with a well developed brush border and a large capillary in
the connective tissue core of the villus. (B) High power light micrograph of
the mucosa epithelium. Note the dense layer of lyphocytes and a large mast
cell below the epithelium. (C) High power light micrograph of the tip of a
villus with necrotic cells. Necrotic cells are enlarged as compared with
healthy enterocytes and show different degrees of lysis of the cell membranes
as well as the nuclei. (D) Low power transmission electron micrograph. Note
the dense distribution of mitochondria and lipid droplets. (E) High power
transmission electron micrograph of the brush border with pinocytotic pits at
the basis of microvilli (arrows). bb, brush border; c, capillary; eec,
enteroendocrine cell; iel, intraepithelial lymphocyte; l, lymphocytes; la,
lacteal; lp, lipid droplet; m, mitochondria; mc, mast cell; mv, microvilli; n,
nucleus of enterocytes; ne, necrotic enterocytes.
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