. Gynecological pathology; a manual of microscopic technique and diagnosis in gynecological practice, for students and physicians. ermic layer of ahuman embryo, still without primary vertebrae and chorda. Through sub-sequent division of the mesoderm it fs separated and segmented into twolayers, a parietal and visceral. There results then a symmetrical space UmMl. ves-icle meso-derm. V-yr Ectoderm f-\\— Mesoderm i \ 3 1 7 IjQ /(-— Mesoderm division V ^3£ssss^!*3^--it~ Entoderm Figuee 73.—Middle Blastodermic Laxee of a Human Embryo., still without PrimaryVertebrae
. Gynecological pathology; a manual of microscopic technique and diagnosis in gynecological practice, for students and physicians. ermic layer of ahuman embryo, still without primary vertebrae and chorda. Through sub-sequent division of the mesoderm it fs separated and segmented into twolayers, a parietal and visceral. There results then a symmetrical space UmMl. ves-icle meso-derm. V-yr Ectoderm f-\\— Mesoderm i \ 3 1 7 IjQ /(-— Mesoderm division V ^3£ssss^!*3^--it~ Entoderm Figuee 73.—Middle Blastodermic Laxee of a Human Embryo., still without PrimaryVertebrae. Transverse Section. (Keibel.) called celom, the walls of which gradually approach in the anteriormedian line and form the cylindrical body shape through their union,with resulting closure of the intestinal canal and the body wall (Fig. 74).This space in the embryonal body, called celom, is intended to ac-commodate the internal organs or viscera. It is divided into three spaces:1, primitive pericardial space; 2, the pleural spaces; 3, the abdominalcavity (Fig. 75). Ectoderm Parietal mesodermVisceral mesoderm Entoderm. Medullary canal Vegetative canalCelom - Uml). vesicle Figure 74.—Animal and Vegetative Canals. Schematic. (Kollmann.) The parietal layer of mesoderm (the celom wall [Fig. 75]) consists ofmesoderm from which develop the connective tissues and involuntary palemuscle fibres. Externally it is covered by ectoderm and internally bythe celom epithelium, which consists of mesoderm cells. The visceral layer of the mesoderm also covers, on the posterior bodywall, the entire intestinal canal (Figs. 74 and 75), forms the intestinalmesenterium commune (Fig. 80), and furnishes the muscle layers for theintestine, and connective tissue cells and muscle fibres for its mucosa. It 166 CLOACA. is, therefore, naturally lined by entoderm, and is itself covered ex-ternally by celom epithelium. This epithelium is, as may be seen later,the point of location for the formation of
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