. A laboratory manual and text-book of embryology. Embryology. Fig. 79.—Yolk-sac and-stalk of a 20 mm. human embryo. X n. AIid-brain In later stages, with the development of the umbilical cord, the yolk-stalk becomes a slender thread extending from the dividing line between the fore- and hind-guts to the yolk-sac or umbilical vesicle (Fig. 114). It loses its attach- ment to the gut in 7 mm. embryos. A blind pocket may persist at its point of union with the intestine and is known as Meckel's diverticulum, a struc- ture of clinical importance because it may telescope and cause the oc- clusion of
. A laboratory manual and text-book of embryology. Embryology. Fig. 79.—Yolk-sac and-stalk of a 20 mm. human embryo. X n. AIid-brain In later stages, with the development of the umbilical cord, the yolk-stalk becomes a slender thread extending from the dividing line between the fore- and hind-guts to the yolk-sac or umbilical vesicle (Fig. 114). It loses its attach- ment to the gut in 7 mm. embryos. A blind pocket may persist at its point of union with the intestine and is known as Meckel's diverticulum, a struc- ture of clinical importance because it may telescope and cause the oc- clusion of the intestinal lumen. The yolk-stalk may remain embedded in the umbilical cord and extend some distance to the yolk-sac which is found between the amnion and chorion (Fig. 79). The yolk-sac may be persistent at Hind-brain i nditorv vesicle Branchial arches Amnion (cut) Body-stalk THE ANATOMY OF A MM. HUMAN EMBRYO Fig. 80.—Left side of a human embryo of mm. (His). This embryo, studied and de- scribed by His, is probably not quite normal. It shows a concave dorsal flexure which Keibel regards as due to distortion. Viewed from the left side (Fig. 80), with the amnion cut away close to its line of attachment, there may be seen the yolk-stalk, and a portion of the yolk-sac and of 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 Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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