. The elements of embryology. Chickens -- Embryos. IT.] THE ALIMENTARY CAXAL. Gl Fig. Embryo of the Chick at 36 hours viewed from above as an opaque object. (Chromic acid preparation.) /. b. front brain, m. L. mid brain, h. b. hind brain, op. v. optic vesicle. au. p. auditory vesicle. 0. f. omphalo-mesaraic vein. p. r. protovertebra. in. f. line 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. The line to the side between p. v. and m. /. represents the true length of the embry
. The elements of embryology. Chickens -- Embryos. IT.] THE ALIMENTARY CAXAL. Gl Fig. Embryo of the Chick at 36 hours viewed from above as an opaque object. (Chromic acid preparation.) /. b. front brain, m. L. mid brain, h. b. hind brain, op. v. optic vesicle. au. p. auditory vesicle. 0. f. omphalo-mesaraic vein. p. r. protovertebra. in. f. line 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. The line to the side between p. v. and m. /. represents the true length of the embryo. Tne biscuit-shaped outline indicates of the p'dlucid area. The head, which reaches as far back as , is distinctly marked off; but neither the somatopieuric nor splanchnopleuric folds are shewn in the fisjure; the latter diverge at the level of , the former considerably nearer the front, somewhere between the lines m. b. and h. b. The optic vesicles op. v. are seen bulging out beneath the superficial epiblast. The heart lying underneath the opaque body caunot be seen. The tail-fold, t., is just indicated ; no distinct lateral folds are as yet visible in the region midway between head and tail. At m. f. the line of junction between the medullary folds is still visible, being logt forwards over the cerebral vesicles, while behind the folds diverge to enclose the narrowing sinus rhomboidalis, s. 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
