A textbook of obstetrics . Visceral layerof mesoder?n. Entoderm. Fig. 64.—Transverse section of the embryonic area of a fourteen-and-a-half-day ovum of sheep (Bonnet). lateral plates forbody-walls. /literal plates forgut-tract. Somite Lateral zone Axial zone. y Neural canal. Cavity within Parietal mesoderm. Pleuroperitontalcavity. Vittlline 65.—Transverse section of a seventeen-and-a-half-day sheep embryo (Bonnet). nopleure. At the end of the second week the development ofthe embryo proper begins, by the formation of the neural UAd^,the neural canal, the chorda dorsalis, or
A textbook of obstetrics . Visceral layerof mesoder?n. Entoderm. Fig. 64.—Transverse section of the embryonic area of a fourteen-and-a-half-day ovum of sheep (Bonnet). lateral plates forbody-walls. /literal plates forgut-tract. Somite Lateral zone Axial zone. y Neural canal. Cavity within Parietal mesoderm. Pleuroperitontalcavity. Vittlline 65.—Transverse section of a seventeen-and-a-half-day sheep embryo (Bonnet). nopleure. At the end of the second week the development ofthe embryo proper begins, by the formation of the neural UAd^,the neural canal, the chorda dorsalis, or notochord, and thesomites, or provertebra_\ The normal development of the em-bryonal body now depends, in its gross features, upon an arching-over process of cells which inclose the spinal canal, the 74 PREGNANCY. abdominal and thoracic cavities, and the cranial cavity. Anarrest in these developmental processes results in such deformi-ties as spina bifida, exomphalos, celosoma, hydrencephalocele,and anencephalia. CHAPTER Development of the Embryo and Fetus. The changes in the developing embryo and fetus1 that markits growth from month to month have practical value for the ob-stetrician when he would determine the probable date of im-pregnation from the appearance of the cast-off
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
