A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . from a ridgeof cells known as the neuralcrest which lies on each sidealong the line of separationbetween the neural tube andthe general ectoderm (). The cells which servethe functions of general sensibility in the root gangliaof the spinal and cerebral nerves arise from the neuralcrest. In lower vertebrates some cells of the neuralcrest are incorporated into the neural tube and heredevelop precociously for cutaneous innervation before REFERENCE HANDBOOK OF T
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . from a ridgeof cells known as the neuralcrest which lies on each sidealong the line of separationbetween the neural tube andthe general ectoderm (). The cells which servethe functions of general sensibility in the root gangliaof the spinal and cerebral nerves arise from the neuralcrest. In lower vertebrates some cells of the neuralcrest are incorporated into the neural tube and heredevelop precociously for cutaneous innervation before REFERENCE HANDBOOK OF THE MEDICAL SCIENCES Brain, Anatomy of the sjjiiial Ranslia have reachoci functional inalurity:these are tlie transitory giant cells fountl in the spinalcord of some fishes. They usually disappear beforeadult life is reached. It is probable that the mes-encephalic nucleus of the trigeminus in mammalsrepresents a jjersisfenl variant form of this mode ofdevelopment, for the preponderance of evidence atthe present time favors the belief that this nucleus Amnion Medullarygroove Encephalon. 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
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913
