. The elements of Embryology. Embryology. III.] VERTEBEAL PLATE. 69 enlarges, while that in the vertebral plate remains in the condition of a mere split. Fig. Ch '.10 \pc ^pp Transverse Section through the Dorsal Eegion op an Embryo of the Second Day (copied from His), intro- ' duced here to illustrate the formation of the mesoblastic somitis, and the cleavage of the mesoblast. M. medullary canal; Pi\ mesoblastic somite ; w. nidiment of Wolffian duct; ^4. epiblast; C. hypoblast; Ch. notochord; Ao. aorta ; BC. splanchnopleure. At first each vertebral plate is not only unbroken along its le
. The elements of Embryology. Embryology. III.] VERTEBEAL PLATE. 69 enlarges, while that in the vertebral plate remains in the condition of a mere split. Fig. Ch '.10 \pc ^pp Transverse Section through the Dorsal Eegion op an Embryo of the Second Day (copied from His), intro- ' duced here to illustrate the formation of the mesoblastic somitis, and the cleavage of the mesoblast. M. medullary canal; Pi\ mesoblastic somite ; w. nidiment of Wolffian duct; ^4. epiblast; C. hypoblast; Ch. notochord; Ao. aorta ; BC. splanchnopleure. At first each vertebral plate is not only unbroken along its length, but also continuous at its outer edge with the upper and lower layers of the lateral plate of the same side. Very soon, however, clear trans- verse lines are seen, in surface views (Fig. 23), stretch- ing inwards across each vertebral plate from the edge of the lateral plate towards the notochord; while a transparent longitudinal line makes its appearance on either side of the notochord along the line of junction of the lateral with the vertebral plate. The transverse lines are caused by the formation of vertical clefts, that is to say, narrow sjDaces containing nothing but clear fluid ; and sections shew that they. 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 Foster, M. (Michael), Sir, 1836-1907. London, MacMillan
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Keywords: ., bookautho, bookcentury1800, bookdecade1880, booksubjectembryology
