. The elements of Embryology. Embryology. v.] THE BRAIN. 99 A. epiblast. B. mesoblast. C. hypoblast consisting of a single row of flattened cells. Jf. c. medullary canal. F. v. meso- blastic somite. W. d. Wolffian duct. & o. Somatopleure. Splanchnopleure. P-P- pleuroperitoneal ca\aty. notochord. a. o. dorsal aorta, v. blood-vessels of the yolk- sac, line of junction between opaque and pellucid areas ; w, palisade-like yolk spheres which constitute the ger- minal wall. Only one-half of the section is represented in the figure—if completed it would be bilaterally symmetrical a
. The elements of Embryology. Embryology. v.] THE BRAIN. 99 A. epiblast. B. mesoblast. C. hypoblast consisting of a single row of flattened cells. Jf. c. medullary canal. F. v. meso- blastic somite. W. d. Wolffian duct. & o. Somatopleure. Splanchnopleure. P-P- pleuroperitoneal ca\aty. notochord. a. o. dorsal aorta, v. blood-vessels of the yolk- sac, line of junction between opaque and pellucid areas ; w, palisade-like yolk spheres which constitute the ger- minal wall. Only one-half of the section is represented in the figure—if completed it would be bilaterally symmetrical about the line of the medullary canal. take place of course beneath the common epiblastic investment, which is not involved in them. As a con- sequence, though easily seen in the transparent fresh. Head of a Chick at the End of the Second Day viewed FROM BELOW AS A TRANSPARENT ObJECT. (Copied from Huxley). /. first cerebral vesicle, a. optic vesicle, d. infundibulum. The specimen shews the formation of the optic vesicles (a), as outgrowths from the 1st cerebral vesicle or vesicle of the 3rd i ventricle, so that the optic vesicles and vesicle of the 3rd ven- tricle at first freely communicated with each other, and also the growth of the lower wall of the vesicle of the 3rd ventricle into a process which becomes the infundibulum id). 7—2. 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
Size: 1198px × 2086px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookautho, bookcentury1800, bookdecade1880, booksubjectembryology
