. The development of the chick; an introduction to embryology. Birds -- Embryology. 314 THE DEVELOPMENT OF THE CHICK are formed as folds and culs-de-sac excavated in the thickness of the original epithelial wall, by elevations of the subjacent con- nective tissue. It should be noted finally, that from the eighth day on, the surface of the mucosa, both in the proventriculus and in the gizzard, is covered with a thick layer of secretion; subse- quently replaced in the gizzard by the corneous lining. X '^%^' ^ ^z-^- Ca\/.pc. ' Cdi/.pc Fig. 182. — Photograph of a transverse section of an 8-
. The development of the chick; an introduction to embryology. Birds -- Embryology. 314 THE DEVELOPMENT OF THE CHICK are formed as folds and culs-de-sac excavated in the thickness of the original epithelial wall, by elevations of the subjacent con- nective tissue. It should be noted finally, that from the eighth day on, the surface of the mucosa, both in the proventriculus and in the gizzard, is covered with a thick layer of secretion; subse- quently replaced in the gizzard by the corneous lining. X '^%^' ^ ^z-^- Ca\/.pc. ' Cdi/.pc Fig. 182. — Photograph of a transverse section of an 8-day chick through the region of the proventriculus and tip of the heart. A. coel., Coeliac artery. A. o. m., Omphalomesenteric artery. Cav. om., Cavum omenti. Cav. pc, Pericardial cavity. Coel., Coelome. Gon., Gonad. Lig. g-h., Gastro-hepatic ligament. M. D., Miillerian duct. Mtn., Metaneph- ros. p'c, Membranous pericardium. Pr'v., Proventriculus. S'r., Supra- renal. V. c. i., Vena cava inferior. Ven., Ventricle of heart. V. h. 1., Left hepatic vein. V. s'c, Subcardinal vein. V. umb., Umbilical vein. Large Intestine, Cloaca, and Anus. The cloaca of the adult is a large chamber opening to the exterior by the anus; it consists of three divisions: the proctodseum or terminal chamber is capable of being closed by the sphincter muscle, the bursa Fabricii opens into its dorsal wall, and it is separated by a strong circular fold. 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 Lillie, Frank Rattray, 1870-1947. New York, Holt
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