area between cheeks and teeth

external: cheeks and lips

roof:hard and soft palate

floor: mylohyoid muscle

Posterior: communicates with oropharynx and bounded posteroinferiorly by epiglottis and posterolaterally by palatoglossal folds.

-Buccal and labial vestibules

-labial frenula(superior and inferior) 

-mucobuccal and mucolabial folds

-incisive fossa

-Parotid papilla for parotid (stenson's) duct

-labial and buccal glands

-gingiva 

-mucogingival junction

-alveolar mucosa

-interdental papilla

-retromolar papilla 

Oral Cavity Proper

Floor

-Surface of tongue 

-Lingual Frenulum 

-Sublingual Folds (plica sublingualis)

-Fimbriate folds(plica fimbriata)

-Sublingual caruncle 

Oral Cavity Proper Boundaries

Roof,Floor,Posterior

Roof: palate

Floor: Mylohyoid m.

Posterior: Fauces