. Embryology. Embryology; Embryology; genealogy. 216 EMBRYOLOGY METENCEPHALON MYELENCEPHALON OTIC VESICLE BULBUS ARTERIOSUS SINUS VENOSUS FOLD OF AMNION NEURAL TUBE. MESENCEPHALON DIENCEPHALON TELENCEPHALON ATRIUM VITELLINE ARTERY PRIMITIVE STREAK Fig. 134. The 48-hour chick embryo with some of its vascular area. In the head region the five divisions of the brain have acquired definite boundaries (Fig. 97). The spiral formation of the heart places the atrium anterior, the ventricle posterior. A sinus venosus forms the first section of the heart to receive blood from the vitelline veins. The bu
. Embryology. Embryology; Embryology; genealogy. 216 EMBRYOLOGY METENCEPHALON MYELENCEPHALON OTIC VESICLE BULBUS ARTERIOSUS SINUS VENOSUS FOLD OF AMNION NEURAL TUBE. MESENCEPHALON DIENCEPHALON TELENCEPHALON ATRIUM VITELLINE ARTERY PRIMITIVE STREAK Fig. 134. The 48-hour chick embryo with some of its vascular area. In the head region the five divisions of the brain have acquired definite boundaries (Fig. 97). The spiral formation of the heart places the atrium anterior, the ventricle posterior. A sinus venosus forms the first section of the heart to receive blood from the vitelline veins. The bulbus arteriosus conducts blood to the ventral aorta. The otocyst and one clear branchial groove may be seen in the pharyngeal region dorsal to the heart. Continuing posteriorly, the fold of the amnion has reached somite 20. A tail fold develops just posterior to the remains of the primitive streak. (Courtesy Mr. Lester A. Barrer, Sloan-Kettering Institute.) Within the embryo itself considerable development has occurred between 33 and 48 hours of incubation. The three divisions of the brain have in- creased to five—the telencephalon, diencephalon, mesencephalon, meten- cephalon, and myelencephalon. The boundaries of these divisions and their derivatives were discussed in Chapter 11. The optic vesicles have induced the lens of the eye and have themselves been converted into optic cups. The. 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
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