ORAL CAVITY

BY: Dr. Pamela Josefina T. Fabie

I. LIPSThese are two fleshy folds that circumscribe the mouth and closes the cavity. At the sides they unite to form the oral commisures

5 LAYERS

1. Skin – contains hair follicles and sebaceous glands2. Superficial Fascia- contains some fats3. Orbicularis Oris muscle – serves as sphincter of the

mouth4. Submucous tissue – contains vessels, mucous labial

glands and labial branches of facial artery5. Mucous membrane – innermost layer

II. MOUTH PROPER

Oral Cavity Proper

Oral Vestibule

a. ORAL VESTIBULE

Boundaries:1. Anteriorly by lips2. Laterally by cheeks3. Posteriorly and

medially by teeth and gums

b. ORAL CAVITY PROPER

Boundaries:1. Anteriorly laterally

by teeth and gums

2. Superiorly by the palate

3. Inferiorly by the tongue and the floor of the mouth

4. Posteriorly by opening into the pharynx

III. FLOOR OF THE MOUTH

Lingual frenulum (connects the tongue to the floor of the mouth)

Papillae ( openings of submandibular duct)

Sublingual fold(passes lateraly and backwards from the papilla and overlies the sublingual gland)

Each sublingual compartment contains submandibular gland and dcuts, lingual and hypoglossal nerve and the

siblingul vessels.

IV. SUBLINGUAL GLAND Smallest salivary gland Indicated by the sublingual

fold, found between the alveolus and anteiror part of the tongue

Lesser sublingual duct (Rivini’s ducts) – opens into the floor of the mouth

Greater sublingual duct (Bartholin’s ducts) opens on the sublingual caruncle

V. SUBMANDIBULAR (SUBMAXILLARY) GLAND

Located at the submandibular fossa below mylohyoid muscle.

Submandibular duct (Wharton’s ducts) – opens at the sublingual papillae

VII. GINGIVA Consists of dense vascular fibrous tissue which is

covered by mucuos membrane and attached to the alveolar margins of the jaws.

VII. TEETH

VIII. HARD PALATE

o Covered by mucous membrne and forms a partition between the oral and the nasal cavity

o The mucous membrane and the periosteum cannot be separated (mucoperiosteum)

Median raphe

IX. SOFT PALATEMovable portion and is attached to the hard palate

Palatine tonsil is also called “Isthmus of Fauces” or the Tonsilar Sinus

Levator Palatini – brings soft palate in contact with posterior pharyngeal wall, preventing food from going upward ino the nasopharynx

Tensor Palatini – tenses the soft palate

Palatoglossus – raises the tongue

Uvulae muscle – raises the uvula

X. TONGUE

Mobile mass of muscles lying on the floor of the mouth and associated with functions of taste, chweing, swallowing and speaking

PAPILLAE OF THE TONGUE

TASTE DISTRIBUTION

Muscles of the Tongue

a. Extrinsic muscles responsible for changing

the position of the tonguea. Gionioglossusb. Geniohyoid

b. Intrinisic muscles change the shape of the

tonguea. Superior longitudinal

musclesb. Inferior longitudinal

musclesc. Transverse muslced. Vertical muscles

End