Anatomy oral cavity
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Transcript of 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.