The retromandibular vein, also known as the posterior facial vein, is a major vein in the head and neck region that drains blood from the superficial temporal vein and the maxillary vein. Synonyms for the retromandibular vein include the posterior facial vein, the posterior auricular vein, and the posterior division of the retromandibular vein. Other related terms include the external jugular vein, which is a larger vein that receives blood from the retromandibular vein, and the parotid gland, which is a gland near the retromandibular vein's origin that produces saliva. The retromandibular vein is an important structure in head and neck anatomy and plays a crucial role in circulation and drainage of the region.