Human anatomy, including structure and development and practical considerations . rain. In this manner the important tracts ofthe posterior columns and the spinal constitu-ents of the restiform body and of the brain-stemare added and, still later, the bulky pyramidstake form when the cerebro-spinal paths areestablished. In accord with the falling apart and thick-ening that affect the lateral walls of the mye-lencephalon and lead to the production of themedulla, the roof-plate of the brain-vesiclebecomes flattened and laterally expanded to keep pace with the increasing width of the ventricularf
Human anatomy, including structure and development and practical considerations . rain. In this manner the important tracts ofthe posterior columns and the spinal constitu-ents of the restiform body and of the brain-stemare added and, still later, the bulky pyramidstake form when the cerebro-spinal paths areestablished. In accord with the falling apart and thick-ening that affect the lateral walls of the mye-lencephalon and lead to the production of themedulla, the roof-plate of the brain-vesiclebecomes flattened and laterally expanded to keep pace with the increasing width of the ventricularfloor. In consequence, the roof-plate is converted into a rhomboidal sheet of great delicacy, thepri»iary velum, which histologically consists of little more than the layer of ependymal , however, soon come into close relation with the overlying mesoblastic tissue from whichthe pia is differentiated. During the third month a transverse fold, the plica chorioidca, appearsin the roof-sheet, near the posterior limit of the developing cerebellum (Fig. 955, B). Into this. />
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
