. Human embryology and morphology. Embryology, Human; Morphology. THE BRAIN AND SPINAL COED. 195 (2) As the caudal termination of the neural canal is never parated from the epiblast over the coccyx, the posterior end of e cord with its pial covering (mesoblast) is pulled out into a le stringâthe filum terminate. The neural canal extends for me way into the filum terminale, and in the foetus shows there dilatation or ventricle. The arachnoid and dura mater, meso- astic sheaths of the cord, do not suffer in the retraction of the rd; they remain widely open to the level of the 2nd sacral rtebra.
. Human embryology and morphology. Embryology, Human; Morphology. THE BRAIN AND SPINAL COED. 195 (2) As the caudal termination of the neural canal is never parated from the epiblast over the coccyx, the posterior end of e cord with its pial covering (mesoblast) is pulled out into a le stringâthe filum terminate. The neural canal extends for me way into the filum terminale, and in the foetus shows there dilatation or ventricle. The arachnoid and dura mater, meso- astic sheaths of the cord, do not suffer in the retraction of the rd; they remain widely open to the level of the 2nd sacral rtebra. Neurenteric Canal.âThe caudal ends of the medullary plates Id over and include within the neural canal the blastopore 'ig. 158). The blastopore occurs at the anterior end of the â imitive streak and marks the point at which the cavity of e hypoblast (that part which becomes the hind-gut) opens i the epiblast. There is thus set up a communication between e neural canal and the gut to which the name of neurenteric ,nal is given (see p. 121). The neurenteric canal also opens to the posterior end of the canal of the notochord. Differentiation of the Spinal Part of the Neural Tube.â rhen the medullary plates close in about the 14th day to form spongio-bl. germ, cells. post, root gang. outer zone middle zone inner zone ant root Fig. 100.âDiagrammatic Section showing the three Zones of the Spinal Neural Tube at the Gth week. ie neural tube, they are composed of a layer of elongated epithelial piblastic) cells. By the 6th week these cells have ⢠undergone ie following changes (Fig. 160):. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
