A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Y~ Medullary tube Medullary tube notF^^^ll yet closed linea priniitiva Fig. 875.—Eternods Embryo of Eight Primitive Segments, mm. long. (,\fter Kollmaim, from Keibel and Malls Hand-buch der Entwicklungsgeschichte des Menschen.) nerves and of the gustatory nerves (Landacre).These series of placodes are known to occur in humanembryos also and probably they contribute cells tothe cerebral ganglia in similar fashion. Cf. thearticle Cranial Nerves. Histogenesis.—^Th
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Y~ Medullary tube Medullary tube notF^^^ll yet closed linea priniitiva Fig. 875.—Eternods Embryo of Eight Primitive Segments, mm. long. (,\fter Kollmaim, from Keibel and Malls Hand-buch der Entwicklungsgeschichte des Menschen.) nerves and of the gustatory nerves (Landacre).These series of placodes are known to occur in humanembryos also and probably they contribute cells tothe cerebral ganglia in similar fashion. Cf. thearticle Cranial Nerves. Histogenesis.—^The histogenesis of the neural tubestarts from a simple colunmar epithelium in theneural plate, which after the closure of the tubebecomes a complex syncytium, the myelospongium, which rajudly in thickness in the lateral wallabut retains its simple epithelial non-nervous characterin the roof and floor of the tube. The originalepithelial cells partially or completely lose their. Fio. 876.—Three Stages in the Closure of the Neural Tube andFormation of the Neural Crest. From transverse of ahuman embryo of mm. (13 pairs of primitive segments).(.\fter von Lenhossek.) identity, their nuclei proliferate rapidly near theventricular surface and in later stages migrate out-ward embedded in strands of denser protoplasmwhich in general are radially disposed with many m/.e.
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
