The Mouth. The mouth cavity is divided into vestibule & mouth cavity proper. Vestibule of mouth lies between lips + cheeks (buccinator) externally, /and gums + teeth internally. The mouth cavity proper : Boundaries : 1-In front and at the sides : gums & teeth
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2- Roof : hard palate in front& soft palate behind.
3- Floor : anterior 2/3 of tongue & sublingual region.
4-Posteriorly : mouth communicates with oropharynx by oropharyngeal isthmus.
The cheekforms the lateral wall of the vestibule and is made up of the buccinatormuscle, which is covered on the outside by fascia and skin and is lined by mucous membrane.
-It is bounded laterally by alveolar arches and continuous behind with soft palate. -It formsfloor of nasal cavities. –It is covered with muco-periosteum.
palatoglossal & palatopharyngeal arches :arefolds of mucous membranes covering the muscles of sot palte, palatoglossus &/ palatopharyngeus in the oropharynx.