. Embryology. Embryology; Embryology; genealogy. BULBUS ARTERIOSUS AORTA DIENCEPHALON LENS VESICLE. LARYNGOTRACHEAL GROOVE ANTERIOR CARDINAL VEIN ATRIUM Fig. 149. Two sections through the lens vesicle, optic cup, and laryngo- tracheal groove. The lens vesicle has separated from the ectoderm and lies within the optic cup. Two layers are distinguishable in the optic cup: (1) a thick sensory layer, which will give rise to the photoreceptors and which contains the neuroblasts for the optic nerve; (2) a pigment layer, which will deposit the black pigment of the eye. From the floor of the pharynx a
. Embryology. Embryology; Embryology; genealogy. BULBUS ARTERIOSUS AORTA DIENCEPHALON LENS VESICLE. LARYNGOTRACHEAL GROOVE ANTERIOR CARDINAL VEIN ATRIUM Fig. 149. Two sections through the lens vesicle, optic cup, and laryngo- tracheal groove. The lens vesicle has separated from the ectoderm and lies within the optic cup. Two layers are distinguishable in the optic cup: (1) a thick sensory layer, which will give rise to the photoreceptors and which contains the neuroblasts for the optic nerve; (2) a pigment layer, which will deposit the black pigment of the eye. From the floor of the pharynx a deep groove develops. This is the laryngotracheal groove, which will form the endodermal lining of lungs and trachea. The sections pass through the bulbus arteriosus and through the atrium of the heart. Note the anterior cardinal veins approaching the atrium. â¢â¢^^â¢r**" \ â=2s>v_ 1 ^â *3L W^ ri. ^ in JSfu fcjS3^ pjppp"" f£^ » ' ATRIUM â SINUS VENOSUS DUCT OF CUVIER Fig. 150. The olfactory pits. This is a section through the telencephalon and the spinal cord. The olfactory placodes noted at 48 hours invaginate and form pits. Neuroblasts in this tissue will form the olfactory nerve by sending fibers into the cerebral hemispheres. In the heart the section passes through the bulbus arteriosus, the atrium, and the sinus venosus. The duct of Cuvier, which receives the cardinal veins, enters the sinus venosus just one section anterior to the one shown here. 225. 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 Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press
Size: 2393px × 1044px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, booksubjectembryology, booksubjectgenealogy
