Venous System

Venous System
Veins from lungs called pulmonary veins return the oxygenated blood to the left atrium of heart.
Two major veins superior vena cave and inferior vena cave carry the deoxygenated blood from rest of the body and empty into right atrium.
Superior vena cave forms when different veins from head, shoulders and arms join together. From legs, the deoxygenated blood is returned to heart by many veins which empty into inferior vena cave. Veins carrying blood from calf, foot and knee join together to form femoral vein. It empties into external iliac vein which join with the internal iliac and both empty into common iliac vein. Right and left common iliac veins join to form inferior vena cave. Many short veins empty into inferior vena cave. among these are hepatic vein, renal vein and gonadal veins. All veins coming from stomach, sleep, pancreas and intestine drain into hepatic portal vein, which carries blood to liver.From liver, a hepatic vein carries blood and empties into inferior vena cave. Two renal vein carry blood from kidneys while two gonadal veins carry blood from gonadal to inferior vena cave. In thoracic cavity inferior vena cave also receives veins from thoracic walls and ribs.
Major Veins of the Body

Source of Photo
All data collected from my book of science.