Anatomy oral cavity

BRI

Anatomyof

oral cavityBRIG ANWAR UL HAQ

03018513303

ORAL CAVITY• The oral cavity extends from the lips to the

oropharyngeal isthmus, i.e. up to the level of anterior pillar of tonsils.

PARTS

PARTS• Lips• Buccal or cheek mucosa• Gums (gingivae)• Retromolar trigone • Hard palate • Oral tongue • Floor of mouth

Lips• They form anterior boundary of the oral

vestibuIe.

Lymphatic Drainage of lips

• Lower: – Medial portion of lower lip drains into• submental

– lateral portion• submandibular nodes.

• Upper: – Preauricular– infraparotid – submandibular

BUCCAL OR CHEEK MUCOSA

• It lines the inner surface of cheeks and lips• Extends up to – pterygomandibular raphe– Anteriorly, it extends to the meeting line of lips.

BUCCAL MUCOSA• Submental• Submandibular

Gums (gingivae)• They surround the teeth and cover the upper

and lower alveolar ridges.

Oral Vestibule

Boundaries:1. Anteriorly - lips2. Laterally -cheeks3. Superiorly -

Mucolabial Mucobuccal folds

4. Posteriorly &medially by the teeth and gums.

Lymphatic Drainage of Gums• Buccal aspect of mucosa – Submental – Submandibular

• Lingual aspect of upper alveolus – Upper deep cervical – Lateral retropharyngeal nodes.

• Lingual aspect of lower alveolus– Submandibular

RETROMOLAR TRIGONE• Triangular area of mucosa covering anterior

surface of the ascending ramus of mandible. • Base – Posterior to the last molar while

• Apex– Adjacent to the tuberosity of maxilla

HARD PALATE• It forms roof of the oral cavity.

VENOUS DRAINAGE AND LYMPHATICS

ORAL TONGUE• Only anterior 2/3 – – included in the oral cavity.

• Posterior 1/3– Base of tongue is situated behind the circumvallate

• Papillae and forms part of the oropharynx. • Oral Tongue is divided into – Tip– lateral borders– Dorsum– Undersurface.

BLOOD AND NERVE SUPPLY

Lymphatic Drainage

Tip:• Submental nodes

bilaterally & then deep cervical nodes

Anterior two third:• Submandibular

unilaterally & then deep cervical nodes

Posterior third:• Deep cervical nodes

(jugulodigastric mainly)

FLOOR OF MOUTH• Crescent-shaped area between – Gingivae – Undersurface of tongue

• Anterior portion of the floor – Best seen when patient raises the tip of tongue to

touch the hard palate. Frenulum and sublingual papillae with openings of submandibular ducts can be eas ily seen.

• Lateral portion of floor of mouth – Best seen by displacing the lateral surface of tongue in

medial direction with the help of a tongue depressor

Floor of Mouth-Lymphatic Drainage

• . Anterior portion of floor of mouth–Submandibular nodes. –also cross the midline.

• Posterior portion –Upper deep cervical nodes.