THE ARTERIES, 27 
the alimentary canal, and is formed by the 
union of the following veins :— 
i, The gastric vein: from the stomach. 
ii. Intestinal veins: from the whole length of the 
intestines, both small and large. 
iii, The splenic vein: from the spleen: usually 
joins one of the intestinal veins. 
C. The Arteries. 
Fig. 5. Diagrammatic figure of the arterial system of the male frog, from 
the right side. 
a, stomach: }, nostril: c, small intestine: c.a, carotid artery : c.g, carotid 
gland: c.m, cceliaco-mesenteric artery: c.n, cutaneous artery: d, large 
intestine: d.a, dorsal aorta: f, femur: h, spleen: h.a, hepatic artery: 
4, right lung: J.a, lingual artery: m, testis: 0, kidney: 0.a, occipito- 
vertebral artery: p.a@, pulmonary artery: 7, pelvic girdle: s, sternum: s.a, 
subclavian artery: s.c, sciaticartery: t, tongue: ¢.@, truncus arteriosus: wu.a, 
urinogenital arteries: v. ventricle: 1, carotid arch: 2, systemic arch: 3, 
pulmo-cutaneous arch. 
Dissect as for the veins. Passa small cork or roll of paper 
down the esophagus, so as to distend wt and stretch the aortic arches. 
Clean carefully the aortic arches, commencing at the -truncus 
arteriosus ; and follow the several arteries to their distribution, 
removing the veins and other structures when necessary. Note the 
division of the truncus arteriosus in front into right and left 
branches, each of which again divides into three aortic arches -— 
the carotid arch, the systemic arch, and the pulmo-cutaneous 
arch, 
