The image shows a ventral view of some of the major arteries of a preserved bullfrog. Arteries and veins of dissection specimens are often injected with colored latex to make it easier to visualize the extent of the circulatory system. By convention, arteries are injected with red latex and veins with blue latex. Arteries are blood vessels that conduct blood away from the heart, while veins conduct blood toward the heart. Because of this fact, arteries must withstand much greater blood pressure and are therefore thicker (and easier to find). 

Labeled arteries include the two systemic arches (1) that come from the heart.  These blood vessels join to form the large dorsal aorta (2), which continues posteriorly posteriorly until it splits into the two common iliac arteries that supply blood to the legs.  At the point where the systemic arches join, the dorsal aorta gives off a short celiacomesenteric artery (3) that divides into the celiac artery (4) that goes to the stomach (5), pancreas and liver and the mesenteric artery (6) that goes to the small intestine, large intestine and spleen.  Also seen on the image is the large posterior vena cava (7), which receives blood from the liver, kidneys and gonads.