Musculus pterygoideus anterior (Mpa.) attaches to the anterior part of the os alioticum
(Oalio.) which is situated at the anterior to the o.sphenoideum (Os.), and also along to its
antero-external edge. Contacting with the posterior inside of the o.maxillare (Om.), it attaches
the other end to the posterior end of the o.dentale (Od.) through a tendon. It forms a
dorso-lateral wall of oral cavity, and acts as a lifter of the mandible.