[TA] one of a pair of ridges or folds of mucous membrane passing from the soft palate to the side of the tongue; it encloses the palatoglossus muscle and forms the anterior margin of the tonsillar fossa. Also demarcates the oral cavity from the isthmus of fauces. SYN: arcus palatoglossus [TA], anterior pillar of fauces*, plica anterior faucium*, anterior palatine arch, arcus glossopalatinus, glossopalatine arch, glossopalatine fold.