The pterygomandibular raphe (pterygomandibular ligament) is a tendinous band of the buccopharyngeal fascia, attached by one extremity to the hamulus of the medial pterygoid plate, and by the other to the posterior end of the mylohyoid line of the mandible. Its medial surface is covered by the mucous membrane of the mouth. Its lateral surface is separated from the ramus of the mandible by a quantity of adipose tissue. Its posterior border gives attachment to the superior pharyngeal constrictor muscle. Its anterior border attaches to the posterior edge of the buccinator. [ http://en.wikipedia.org/wiki/Pterygomandibular_raphe ]