. The elements of embryology. Chickens -- Embryos. IV.] THE TAIL-FOLD. 75 cavity, c. h. notochord. a. o. dorsal aorta, v. blood-vessels of the yolk-sac. o. p. line of junction between opaque and pellucid areas; at this point the hypoblast cells are seen to pass without any strong line of demarcation into the white-yolk spheres, w. white-yolk spheres, some of which near the edge of the pellucid area contain a body very like a nucleus. Oidy one half of the section is represented in the figure—if completed it would be bilaterally symmetrical about the line of the medullary caual. Fig. ElIBRY
. The elements of embryology. Chickens -- Embryos. IV.] THE TAIL-FOLD. 75 cavity, c. h. notochord. a. o. dorsal aorta, v. blood-vessels of the yolk-sac. o. p. line of junction between opaque and pellucid areas; at this point the hypoblast cells are seen to pass without any strong line of demarcation into the white-yolk spheres, w. white-yolk spheres, some of which near the edge of the pellucid area contain a body very like a nucleus. Oidy one half of the section is represented in the figure—if completed it would be bilaterally symmetrical about the line of the medullary caual. Fig. ElIBRYO OF THE CHICK AT 36 HOURS VIEWED FROM ABOVE AS AN OPAQUE Object. (Chromic acid preparation.) /. b. front brain. m. b. mid brain. h. b. hind brain, op. v. optic vesicle. au. p. auditory vesicle. 0. /. omphalo-mesaraic vein. p. v. protovertebra. m. f. line of junction of the medullary folds above the medullary canal. s. r. sinus rhomboidalis. t. tail-fold. p. r. remains of primitive groove, a. p. area pellucida. embryo being simply a part of a flat blastoderm, nearly completely level from the front protovertebrse to the hind edge of the pellucid area. At this epoch, however, a tail-fold. 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; Balfour, Francis M. (Francis Maitland), 1851-1882. London, Macmillan and co.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
