الفهرس 
Cover Page Title in EnglishOnly 14 pages are availabe for public view
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Abstract
The histogenesis of the intestinal aiuoosae of the Egyptien water butfa1ofetus passes through a previllous and a villous stage with an çxtra post-vi1lous stage in the large Lntestine.
In the previllous stage, the intestinal naucosae consist of a Lemma epithelialis, made up of poorly differentiated densely packed ee11 and a Lemma propria/eubalucosa, raade up of homogeneous avascular tnesenchyuie. Both, the epithelial lusninal surface and the epithelio.-tnesenohymal interface are even.
The villous stage begins in the fetus of 7.5 cm ORL, when the inucosa gives knob-like projections in the duodenum and transito longitudinal folds in the jejwium, i.eum, cecuin, colon and rectum. Any of these structures consists of a luminal epithelial outgrowth and a vascularized inesenchymal stalk. The viUi increase in number by splitting of the knob.mlike projections and the folds by invaGinations. The growth c the villi advances in a cranio—cau.dal direction in the small iv2.testine and in a oaudo-craniJ. one in the large intestine.