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nternal jugular vein. i.il.a., internal iliac artery. i.il.v., internal iliac vein. k., kidney. lv., liver. l.g.v., lienogastric vein (portal). m.v., mesenteric (portal system). p.m.a., posterior mesenteric artery. p.v., main portal vein. p.a. pulmonary artery. r., rectum. r.a., renal artery. r.v., renal vein. s.v., and a., spermatic (or ovarian) vein and artery (to genital organ). s.mes.a., superior mesenteric artery. s.-cl.a., subclavian artery. s.-cl.v., subclavian vein. v.c.s., vena cava superior. v.c.i., vena cava inferior. v. or vn., ventricle. Figure 2. Figure of Circulation (simplified) illustrating certain points in development to be referred to later. Figure 3. Respiration. See text, Section 41. Figure 4. Blood. See text, Section 35. {Illustration: Diagram Sheet 2.} Sheet 3 Histological Figures, 1. {No numbers I., or II.} Figure III. An amoeba.-- n., nucleus. ns., necleolus. c.v., contractile vacuole. Figure IV. Embryonic tissue from the blastoderm of a chick. Figure V. Columnar epithelium.-- g.c.1, g.c.2, g.c.3, successive phases in the development of a goblet cell. Figure VI. g.end., is geminating endothelium; the cells divide and apparently drop off to become white corpuscles in the lymph current. sq.end., squamous endothelium from the mesentery. sq.ep., squamous epithelium (from the mucous membrane within the cheek). st., are opening (stomata) communicating between the lymphatics in the mesentery and the peritoneal (coelomic) space. Figure VII. Ciliated epithelium from the roof of the frog's mouth. Figure VIII. Forms of glands.-- g.ep., is a gastric gland from the stomach; trs., below, is cross section. This is one of the simplest types of gland. s.g., a sweat gland, is also a simple tube, but convoluted below. r.g., is a racemose gland, such as the pancreas, Brunner's or the salivary glands. The kidney, we shall see later, is simply an aggregate of branching tubuli (Sheet 7). Figure IX. A duodenal villus.-- lac., the lacteal. v., the vein. Figure X.a. Diagram of liver structure.-- b.d., the inter-lobular bile duct. h.a., the hepatic artery, bringing blood to oxygenate and nourish the liver tissue, and similarly distributed. h.v., the hepatic vein taking blood from the liver to the heart, its twigs commencing in the lobuli (intra-lobular). lb. lb., lobuli. p.v., the portal vein bringing blood, from which substances are to be elaborated, into
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