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ORAL CAVITY
Skeletal Framework
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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
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Vestibule:
Between lips/cheeks and gums/teeth.
Leads to:
Oral cavity proper.
Receives:
Parotid duct:
Opposite upper second molar.
Mucous Membranes
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Oral cavity:
Bounded by:
Teeth and gums.
Hard/soft palates.
Leads to:
Pharynx (oropharynx).
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Uvula
Sensory Innervation of Mucous
Membranes
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CN V-2:
Greater and lesser palatine nerves.
Nasopalatine nerves.
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CN V-3:
Lingual nerve:
Floor of mouth.
Buccal nerve:
Vestibule and cheek.
Motor Innervation to Mucous
Membranes/Glands
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Sympathetics:
See nasal cavity.
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Sublingual and submandibular glands:
Parasympathetics:
From:
Superior salivatory nucleus via CN VII.
To:
Submandibular/sublingual ganglion.
To:
Submandibular and sublingual glands.
Motor Innervation to Mucous
Membranes/Glands
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Parotid gland:
Parasympathetics:
From:
Inferior salivatory nucleus via CN IX.
To:
Otic ganglion.
To:
Parotid gland.
Innervation of Teeth
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Maxillary teeth:
Superior alveolar branches of CN V-2.
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Mandibular teeth:
Inferior alveolar branches of CN V-3.
Innervation of Tongue
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General sensory:
Anterior two-thirds:
CN V-3 via lingual nerve.
Posterior one-third:
CN IX.
Innervation of Tongue
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Taste:
Anterior two-thirds:
CN VII via chorda tympani.
Posterior one-third:
CN IX.
Tongue
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Tongue is a mass of skeletal muscles covered
by mucosa.
Location:
Anterior two-thirds in oral cavity proper.
Posterior third in oropharynx.
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Sulcus terminalis.
Foramen cecum.
Frenulum.
All intrinsic and extrinsic muscles of the tongue
are innervated by CN XII.
Oropharynx
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Extends:
From:
Soft palate above.
To:
Upper border of epiglottis below.
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Lies at level of second and third cervical
vertebrae.
Oropharynx
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Contains:
Palatine tonsils:
Encapsulated.
Tonsilar branch of facial artery.
Glossopharyngeal nerve.
Oropharynx
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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).
Oropharynx
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Palatoglossus muscle:
From soft palate to lateral surface of
posterior tongue.
Depresses palate.
Vagus nerve (pharyngeal plexus).
Oropharynx
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Tensor veli palatini:
From scaphoid fossa of sphenoid bone and
cartilaginous part of auditory tube to soft
palate.
Tenses soft palate.
Oropharynx
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Levator veli palatini:
From petrous temporal bone and
cartilaginous part of auditory tube to soft
palate.
Elevates soft palate.
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Uvula