. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELA^E SOMITES 99 formed, a short distance back of the anterior end of the medullary plate (Figs. 50 and 51). The posterior ends of the neural folds do not, at this time, reach the region of the first somite. The region where the neural folds first come in contact corresponds approximately with the region of the future mid-brain, or ante- rior part of the hind-brain. 0© © (3 0 ©O^® -1 /-^ .O /-, >y/0 OO o © C> Q Q â 60l,0" -°S2oSoU^»oS<°'^'. Fig. 52 A. â Median l
. The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. HEAD-FOLD TO TWELA^E SOMITES 99 formed, a short distance back of the anterior end of the medullary plate (Figs. 50 and 51). The posterior ends of the neural folds do not, at this time, reach the region of the first somite. The region where the neural folds first come in contact corresponds approximately with the region of the future mid-brain, or ante- rior part of the hind-brain. 0© © (3 0 ©O^® -1 /-^ .O /-, >y/0 OO o © C> Q Q â 60l,0" -°S2oSoU^»oS<°'^'. Fig. 52 A. â Median longitudinal section of the head, stage of 4 s. The sec- tion passes through the length of one of the neural folds just behind the anterior end. (Cf. Fig. 51.) a. i. p., Anterior intestinal portal. Ect., Ectoderm. Ent., Entoderm. F. G., Fore-gut. H. F., Head-fold. Mes., Mesoderm. Mes. H. C, Meso- blastic head cavity, n. F., Neural fold. or. pi., Oral plate. The process of closure itself is essentially the same in all regions of the neural tube. Each neural fold has two limbs: an inner thick limb, belonging to the medullary plate, and an outer, thin limb, continuous with the general ectoderm (cf. Fig. 68 B). When the folds of opposite sides come in contact, the inner limbs of the two sides become continuous with one another, and also the outer limbs, the ectoderm then passing continuously over a closed neural tube. Certain cells in the suture and in the walls of the tube next. 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 Lillie, Frank Rattray, 1870-1947. New York : Henry Holt
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Keywords: ., bookauthorlilliefrankrat, bookcentury1900, booksubjectembryology
