Part of the face just below the nose. It is guarded by two lips - upper and lower lips which has an internal cavity which extends from the isthmus of fauces at its junction with the oropharynx to the inner aspect of the lips. It contains the following

BONES: Maxilla, mandible

Muscles: Circumoral muscles with modiolar attachments: levator labii superioris, levator labii superioris alaeque nasi, levator anguli oris, zygomaticus major, zygomaticus minor, risorius, depressor anguli oris, depressor labii inferioris, malaris, mentalis, orbicularis oris, incisivus labii superioris, incisivus labii inferioris, buccinator

Arteries: Lingual artery, facial artery (tonsillar branch)

Veins: Lingual vein, facial vein

Nerves: Glossopharyngeal nerve, maxillary nerve, mandibular nerve, hypoglossal nerve, facial nerve

Others: Tongue, oral glands, teeth, gums