The term jugular refers to the major veins in the neck that carry blood from the head back to the heart. There are two main jugular veins on each side of the neck: the internal jugular vein, which drains blood from the brain, and the external jugular vein, which drains blood from the face and superficial parts of the head. These veins are important in clinical settings, as changes in jugular vein appearance or pressure can indicate certain cardiovascular conditions.