A system of obstetrics . inate asoutgrowths (Fig. 84) from the fore-brain. These outgrowths appearin mammals even before the vesicles of the fore-brain are closed (). They are represented somewhat later in the diagram (Fig. 86), ata stage when the connection of their cavities with the fore-brain cavityhas become narrowed. The narrowed stem is the optie stalk; the ves-icle on its end is the primary optic vesicle. As the embryo developsthe epiblast lining the primary optic vesicle comes nearly into contact 1 Icones phj/swlogicrr, Leipzig, 1851-59; and Arch, fur Anthrop., 1868. The follow-i
A system of obstetrics . inate asoutgrowths (Fig. 84) from the fore-brain. These outgrowths appearin mammals even before the vesicles of the fore-brain are closed (). They are represented somewhat later in the diagram (Fig. 86), ata stage when the connection of their cavities with the fore-brain cavityhas become narrowed. The narrowed stem is the optie stalk; the ves-icle on its end is the primary optic vesicle. As the embryo developsthe epiblast lining the primary optic vesicle comes nearly into contact 1 Icones phj/swlogicrr, Leipzig, 1851-59; and Arch, fur Anthrop., 1868. The follow-ing may also be consulted : Kolliker, Entwicklungsgeschicte, Leipzig, 1879, p. 563 etseq.;Pansch, Archivf. Anthrop., 1868; Mihalkovic-s, Entwick. d. Gehirns., 1877. 164 DEVELOPMENT OF THE EMBRYO. with the external epiblast; but in mammals a layer of mesoblast alwaysseparates them (Fig. 86). The external epiblast (/, Fig. 86) coveringthe most projecting part of the primary optic vesicle thickens, and then Fig. 96. Fig.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
