The term "isthmus of the fauces", also known as the oropharyngeal isthmus, refers to a narrow passage located at the back of the mouth where the oral cavity meets the throat. Synonyms for this anatomical structure include the posterior oral isthmus, the oropharyngeal junction, or simply the fauces. This small area is crucial for various functions such as swallowing, speaking, and breathing. Understanding the different synonyms for the isthmus of the fauces is essential for medical professionals and individuals interested in human anatomy. By knowing these terms, one can communicate more effectively and accurately regarding this specific area of the oral and pharyngeal region.