Jugular vein is a set of four large veins that send back deoxygenated blood from the head and neck to the heart. There are two types of jugular veins: external and internal jugulars. These are located on each side of the neck. The internal jugular lies deep in the neck. It contains blood which has drained from the front part of the skull. The external jugular vein is the superficial vein. The internal jugular veins are much larger than the external ones.