This document outlines the key anatomical landmarks of the maxillary and mandibular arches. For the maxillary arch, it identifies the limiting structures such as the labial and buccal frenums and vestibules, as well as the hamular notch and vibrating line. It also notes the primary and secondary support areas, and relief areas including the incisive papilla and midpalatine raphe. For the mandibular arch, it outlines similar limiting structures and identifies the buccal shelf as the primary support area and secondary support landmarks like the edentulous ridge crest. Relief areas of the mandibular arch include the mental foramen and mylohyoid ridge.