. A laboratory manual and text-book of embryology. Embryology. Palli, Diencephalon Anterior neuropore Mesencephalon Isthmus Corpus striatum. Mese n c ephalan Cephalic flexure Optic recess Future pontine Rhombencephalon flexure Rhombencephalon Fig. 312.—Reconstructions of the brain of a mm. human embryo. A, lateral surface; B, sectioned in the median sagittal plane (after His). In embryos of mm., estimated age three weeks, three important changes have taken place (Fig. 312 A, B): (1) the end of the neural tube is bent sharply in the mid-brain region so that the axis of the fore-brain no
. A laboratory manual and text-book of embryology. Embryology. Palli, Diencephalon Anterior neuropore Mesencephalon Isthmus Corpus striatum. Mese n c ephalan Cephalic flexure Optic recess Future pontine Rhombencephalon flexure Rhombencephalon Fig. 312.—Reconstructions of the brain of a mm. human embryo. A, lateral surface; B, sectioned in the median sagittal plane (after His). In embryos of mm., estimated age three weeks, three important changes have taken place (Fig. 312 A, B): (1) the end of the neural tube is bent sharply in the mid-brain region so that the axis of the fore-brain now forms a right angle with the axis of the hind-brain. This bend is the cephalic flexure; (2) the fore- brain shows indication dorsally of a fold the margo thalamicus which subdivides it into the telencepalon and the diencephalon; (3) the lateral wall of the fore-brain shows a distinct evagination, the optic vesicle, which projects laterally and caudad. A ventral bulging of the wall of the hind-brain indicates the position of the future pontine flexure. In embryos of 7 mm. (four weeks) the neuropores have closed. The ceph-. 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 Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectembryology, bookyear1
