Arteria communicans posterior, also known as the posterior communicating artery, is a small but vital blood vessel located in the brain. This artery plays a significant role in connecting the middle cerebral artery with the posterior cerebral artery. Although there are no direct synonyms for the term "arteria communicans posterior", it is often abbreviated as ACP. Other related terms that can be used interchangeably with this artery include the posterior communicating branch and the communicating artery. Understanding the functions and connections of the arteria communicans posterior is crucial in studying and diagnosing various conditions associated with the brain and its blood supply.