Vena peroneus refers to a vein present in the lower limb of humans and other mammals. This vein runs parallel to the fibula bone and helps in the return of deoxygenated blood from the foot to the heart. Some common synonyms of vena peroneus include peroneal vein, fibular vein, and lateral vein. In medical terminology, these synonyms are used interchangeably to describe the same vein, which is essential for proper blood circulation in the body. While vena peroneus is the official name for the vein, the use of synonyms makes it easier for medical professionals to communicate and understand medical information related to this vein.