. Embryology. Embryology; Embryology; genealogy. VISCERAL GROOVE 3RD AORTIC ARCH DORSAL AORTA ANTERIOR CARDINAL VEIN ANTERIOR CARDINAL VEIN DIENCEPHALON ORAL CAVITY. THYROID SAC Figs. 147 and 148. Sections through the hypophysis and the thyroid. This is just about the level where the Rathke's pouch is connected with the oral cavity (Fig. 148). The first, second, and third aortic arches are present and the con- nections of the third pair with the dorsal aorta are shown. The two brain sec- tions are the myelencephalon and the mesencephalon. In Figure 148 Rathke's pouch opens into the oral cavity
. Embryology. Embryology; Embryology; genealogy. VISCERAL GROOVE 3RD AORTIC ARCH DORSAL AORTA ANTERIOR CARDINAL VEIN ANTERIOR CARDINAL VEIN DIENCEPHALON ORAL CAVITY. THYROID SAC Figs. 147 and 148. Sections through the hypophysis and the thyroid. This is just about the level where the Rathke's pouch is connected with the oral cavity (Fig. 148). The first, second, and third aortic arches are present and the con- nections of the third pair with the dorsal aorta are shown. The two brain sec- tions are the myelencephalon and the mesencephalon. In Figure 148 Rathke's pouch opens into the oral cavity. The section of the brain adjacent to the pouch is the infundibulum of the diencephalon. The thyroid develops as an evagina- tion of the floor of the pharynx and at this stage is a sac still connected with the pharynx. Later it breaks off and forms a solid thyroid gland. In both figures note the dorsal aorta, the anterior cardinal veins, and the numerous small vessels in the head region. These small vessels are the branches of the carotid arteries. 224. 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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