. A laboratory manual and text-book of embryology. Embryology. THE LIVER l83 and cephalic end of the colon to descend toward the pelvis (Fig. 174). The ascending colon is thus formed and the vermiform appendix takes the position which it occupies in the adult. The development of the mucous membrane of the intestinal tube has been described by Johnson (American Journal of Anatomy, vols, io, 14 and 16, pp. 521-561; 187-233; 1-49). Ascending mesocolon Ascending colon Ccecum. Ascending colon Ccecum Processus vermiformis Processus vermiformis Fig. 175.—The caecum of a human embryo of 5 cm. (Kollman
. A laboratory manual and text-book of embryology. Embryology. THE LIVER l83 and cephalic end of the colon to descend toward the pelvis (Fig. 174). The ascending colon is thus formed and the vermiform appendix takes the position which it occupies in the adult. The development of the mucous membrane of the intestinal tube has been described by Johnson (American Journal of Anatomy, vols, io, 14 and 16, pp. 521-561; 187-233; 1-49). Ascending mesocolon Ascending colon Ccecum. Ascending colon Ccecum Processus vermiformis Processus vermiformis Fig. 175.—The caecum of a human embryo of 5 cm. (Kollmann). A, from the ventral side; B, from the dorsal side. THE LIVER In embryos of mm. the liver anlage is present as a median ventral out- growth from the entoderm of the fore-gut just cranial to the yolk-stalk (Fig. 161 B). Its thick walls enclose a cavity which is continuous with that of the gut. The liver anlage is embedded in the ventral mesentery which lies in the median line between the fore-gut, the ventral body wall, and the septum transversum (Fig. 171 A). Thus, from the first the liver is in close relation to the septum trans- versum and later when the septum becomes a part of the diaphragm the liver remains attached to it. In embryos 4 to 5 mm. long, solid cords of cells proliferate from the ventral and cranial portion of the liver anlage. These cords anastomose and form a crescentic mass with wings extending lateral and dorsal to the gut (Fig. 171 A).. 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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