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ORAL CAVITY

ORAL CAVITY. Skeletal Framework. Hard palate: Anterior two-thirds of palate. Palatine folds of maxillae. Palatines. Soft palate: Posterior third of palate. Fibromuscular fold. Teeth: Maxillary. Mandibular. Mucous Membranes. Vestibule:

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ORAL CAVITY

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  1. ORAL CAVITY

  2. Skeletal Framework • Hard palate: Anterior two-thirds of palate. Palatine folds of maxillae. Palatines. • Soft palate: Posterior third of palate. Fibromuscular fold. • Teeth: Maxillary. Mandibular.

  3. Mucous Membranes • Vestibule: Between lips/cheeks and gums/teeth. Leads to: Oral cavity proper. Receives: Parotid duct: Opposite upper second molar.

  4. Mucous Membranes • Oral cavity: Bounded by: Teeth and gums. Hard/soft palates. Leads to: Pharynx (oropharynx). • Uvula

  5. Sensory Innervation of Mucous Membranes • CN V-2: Greater and lesser palatine nerves. Nasopalatine nerves. • CN V-3: Lingual nerve: Floor of mouth. Buccal nerve: Vestibule and cheek.

  6. Motor Innervation to Mucous Membranes/Glands • Sympathetics: See nasal cavity. • Sublingual and submandibular glands: Parasympathetics: From: Superior salivatory nucleus via CN VII. To: Submandibular/sublingual ganglion. To: Submandibular and sublingual glands.

  7. Motor Innervation to Mucous Membranes/Glands • Parotid gland: Parasympathetics: From: Inferior salivatory nucleus via CN IX. To: Otic ganglion. To: Parotid gland.

  8. Innervation of Teeth • Maxillary teeth: Superior alveolar branches of CN V-2. • Mandibular teeth: Inferior alveolar branches of CN V-3.

  9. Innervation of Tongue • General sensory: Anterior two-thirds: CN V-3 via lingual nerve. Posterior one-third: CN IX.

  10. Innervation of Tongue • Taste: Anterior two-thirds: CN VII via chorda tympani. Posterior one-third: CN IX.

  11. Tongue • Tongue is a mass of skeletal muscles covered by mucosa. • Location: Anterior two-thirds in oral cavity proper. Posterior third in oropharynx. • Sulcus terminalis. • Foramen cecum. • Frenulum. • All intrinsic and extrinsic muscles of the tongue are innervated by CN XII.

  12. Oropharynx • Extends: From: Soft palate above. To: Upper border of epiglottis below. • Lies at level of second and third cervical vertebrae.

  13. Oropharynx • Contains: Palatine tonsils: Encapsulated. Tonsilar branch of facial artery. Glossopharyngeal nerve.

  14. Oropharynx • Palatopharyngeus muscle: Posterior border of hard palate to fascia on lateral and posterior wall of pharynx and thyroid cartilage. Elevates pharynx during swallowing. Vagus nerve (pharyngeal plexus).

  15. Oropharynx • Palatoglossus muscle: From soft palate to lateral surface of posterior tongue. Depresses palate. Vagus nerve (pharyngeal plexus).

  16. Oropharynx • Tensor veli palatini: From scaphoid fossa of sphenoid bone and cartilaginous part of auditory tube to soft palate. Tenses soft palate.

  17. Oropharynx • Levator veli palatini: From petrous temporal bone and cartilaginous part of auditory tube to soft palate. Elevates soft palate. • Uvula

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