. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 198 TEXT-BOOK OF EMBRYOLOGY. tois are connected with its ventral surface (Fig. 94). The umbilical vesicle having reached the limit of its development in the fourth week and having begun to shrink, the vitelline duct likewise begins to retrograde and very soon becomes an inconspicuous structure. The dorsal wall of the tube at a point nearer the head-end begins to bulge toward the dorsal body-wall, forming a some- what spindle-shaped enlargement (Figs. 97, 98). This di- Middle lobe of thyroid glan
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. 198 TEXT-BOOK OF EMBRYOLOGY. tois are connected with its ventral surface (Fig. 94). The umbilical vesicle having reached the limit of its development in the fourth week and having begun to shrink, the vitelline duct likewise begins to retrograde and very soon becomes an inconspicuous structure. The dorsal wall of the tube at a point nearer the head-end begins to bulge toward the dorsal body-wall, forming a some- what spindle-shaped enlargement (Figs. 97, 98). This di- Middle lobe of thyroid gland. Thymus gland. Lateral lobe of thyroid gland. Trachea. Lunp; Right lobe of liver. Vitelline Pharyngeal pouches. Stomach. Pancreas. Left lobe of liver. Small intestine. Larp-e intestine. Fig. 97.—Scheme of the alimentary canal and its accessory organs (Bonnet). latation is the beginning of the future stomach. The part of the canal on the cephalic side of the stomach lags behind somewhat in growth, corresponding in this respect with the relatively smaller size of the adult esophagus. The esoph- agus begins to lengthen in the fourth week. At this time, also, the beginning of the liver is indicated by a small diver-. 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 Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former owner; University College, London. Library Services. Philadelphia : W. B. Saunders Company
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