A textbook of obstetrics . Fig. 63. — Fmbryonic area of rabbit em-bryo : Primitive streak beginning in cell-proliferation, known as the node of Hensen (E. v. Beneden). 1 Tt is not intended to give more than a mere sketch of the development of theembryo. The student interested in the subject is referred to special works, such asMinots Embryology. CHANGES IN OVUM FOLLOWING IMPREGNATION. 73 nished by the entoderm. In the course of its development themesoderm develops lateral reduplications and parts into two layers(the parietal and visceral layers) inclosing spaces,—the body-cavity, or celom (Fig
A textbook of obstetrics . Fig. 63. — Fmbryonic area of rabbit em-bryo : Primitive streak beginning in cell-proliferation, known as the node of Hensen (E. v. Beneden). 1 Tt is not intended to give more than a mere sketch of the development of theembryo. The student interested in the subject is referred to special works, such asMinots Embryology. CHANGES IN OVUM FOLLOWING IMPREGNATION. 73 nished by the entoderm. In the course of its development themesoderm develops lateral reduplications and parts into two layers(the parietal and visceral layers) inclosing spaces,—the body-cavity, or celom (Fig. 64). The parietal or somatic layer uniteswith the ectoderm to form the somatopleure. The visceral orsplanchnic layer joins the entoderm to form the splanch- rrimitive groove. Beginningamnion Visceral layer0/ mesoderm. Entoderm. Fig. 64.—Transverse section of the embryonic area of a fourteen-and-a-half-day ovum of sheep (Bonnet). Axial zone. Neural canal. Somite. Lateral zone. Cavity within somite. Lateral plates forbody-walls. Lateral plates forgut-tract.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
