A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Canalisneurentericus Pedunculus abdominalis Fig. 874.—Neural Plate in an Embryo of Five to Six PrimitiveSegments. (After Keibel and KIze, from Keibel and MallsHaudbuch der Eutmckluug^ge^chichte des Menschen.) gives rise to sensory fibers for deep sensibility in themuscles of the head. In fishes some of the ganglia of the cerebral nervesreceive cells both from the neural crest and fromectodermal placodes which are arranged in two seriesalong the side of the head, a
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . Canalisneurentericus Pedunculus abdominalis Fig. 874.—Neural Plate in an Embryo of Five to Six PrimitiveSegments. (After Keibel and KIze, from Keibel and MallsHaudbuch der Eutmckluug^ge^chichte des Menschen.) gives rise to sensory fibers for deep sensibility in themuscles of the head. In fishes some of the ganglia of the cerebral nervesreceive cells both from the neural crest and fromectodermal placodes which are arranged in two seriesalong the side of the head, a suprabranchial and anepibranchial series. give rise rei^pectively toganglion cells of the acoustic and lateral line seriesof Lamina cerebri Amnion Protovert«bra VII Canalis neurentericus. 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
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
