ORAL CAVITYORAL CAVITY

Skeletal FrameworkSkeletal FrameworkHard palate:Hard palate:

Anterior two-thirds of palate.Anterior two-thirds of palate.Palatine folds of maxillae.Palatine folds of maxillae.Palatines.Palatines.

Soft palate:Soft palate:Posterior third of palate.Posterior third of palate.Fibromuscular fold.Fibromuscular fold.

Teeth:Teeth:Maxillary.Maxillary.Mandibular.Mandibular.

Mucous MembranesMucous MembranesVestibule:Vestibule:

Between lips/cheeks and gums/teeth.Between lips/cheeks and gums/teeth.Leads to:Leads to:

Oral cavity proper.Oral cavity proper.

Receives:Receives:Parotid duct:Parotid duct:

Opposite upper second molar.Opposite upper second molar.

Mucous MembranesMucous MembranesOral cavity:Oral cavity:

Bounded by:Bounded by:Teeth and gums.Teeth and gums.Hard/soft palates.Hard/soft palates.

Leads to:Leads to:Pharynx (oropharynx).Pharynx (oropharynx).

UvulaUvula

Sensory Innervation of Mucous Sensory Innervation of Mucous MembranesMembranes

CN V-2:CN V-2:Greater and lesser palatine nerves.Greater and lesser palatine nerves.Nasopalatine nerves.Nasopalatine nerves.

CN V-3:CN V-3:Lingual nerve:Lingual nerve:

Floor of mouth.Floor of mouth.

Buccal nerve:Buccal nerve:Vestibule and cheek.Vestibule and cheek.

Motor Innervation to Mucous Motor Innervation to Mucous Membranes/GlandsMembranes/Glands

Sympathetics:Sympathetics:See nasal cavity.See nasal cavity.

Sublingual and submandibular glands:Sublingual and submandibular glands:Parasympathetics:Parasympathetics:From:From:Superior salivatory nucleus via CN VII.Superior salivatory nucleus via CN VII.To:To:Submandibular/sublingual ganglion.Submandibular/sublingual ganglion.To:To:Submandibular and sublingual glands.Submandibular and sublingual glands.

Motor Innervation to Mucous Motor Innervation to Mucous Membranes/GlandsMembranes/Glands

Parotid gland:Parotid gland:Parasympathetics:Parasympathetics:

From:From:Inferior salivatory nucleus via CN IX.Inferior salivatory nucleus via CN IX.

To:To:Otic ganglion.Otic ganglion.

To:To:Parotid gland.Parotid gland.

Innervation of TeethInnervation of TeethMaxillary teeth:Maxillary teeth:

Superior alveolar branches of CN V-2.Superior alveolar branches of CN V-2.Mandibular teeth:Mandibular teeth:

Inferior alveolar branches of CN V-3.Inferior alveolar branches of CN V-3.

Innervation of TongueInnervation of TongueGeneral sensory:General sensory:

Anterior two-thirds:Anterior two-thirds:CN V-3 via lingual nerve.CN V-3 via lingual nerve.

Posterior one-third:Posterior one-third:CN IX.CN IX.

Innervation of TongueInnervation of TongueTaste:Taste:

Anterior two-thirds:Anterior two-thirds:CN VII via chorda tympani.CN VII via chorda tympani.

Posterior one-third:Posterior one-third:CN IX.CN IX.

TongueTongue Tongue is a mass of skeletal muscles covered Tongue is a mass of skeletal muscles covered

by mucosa.by mucosa. Location:Location:

Anterior two-thirds in oral cavity proper.Anterior two-thirds in oral cavity proper.Posterior third in oropharynx.Posterior third in oropharynx.

Sulcus terminalis.Sulcus terminalis. Foramen cecum.Foramen cecum. Frenulum.Frenulum. All intrinsic and extrinsic muscles of the tongue All intrinsic and extrinsic muscles of the tongue

are innervated by CN XII.are innervated by CN XII.

OropharynxOropharynxExtends:Extends:

From:From:Soft palate above.Soft palate above.

To:To:Upper border of epiglottis below.Upper border of epiglottis below.

Lies at level of second and third cervical Lies at level of second and third cervical vertebrae.vertebrae.

OropharynxOropharynxContains:Contains:

Palatine tonsils:Palatine tonsils:Encapsulated.Encapsulated.Tonsilar branch of facial artery.Tonsilar branch of facial artery.Glossopharyngeal nerve.Glossopharyngeal nerve.

OropharynxOropharynxPalatopharyngeus muscle:Palatopharyngeus muscle:

Posterior border of hard palate to fascia on Posterior border of hard palate to fascia on lateral and posterior wall of pharynx and lateral and posterior wall of pharynx and thyroid cartilage.thyroid cartilage.

Elevates pharynx during swallowing.Elevates pharynx during swallowing.Vagus nerve (pharyngeal plexus).Vagus nerve (pharyngeal plexus).

OropharynxOropharynxPalatoglossus muscle:Palatoglossus muscle:

From soft palate to lateral surface of From soft palate to lateral surface of posterior tongue.posterior tongue.

Depresses palate.Depresses palate.

Vagus nerve (pharyngeal plexus).Vagus nerve (pharyngeal plexus).

OropharynxOropharynxTensor veli palatini:Tensor veli palatini:

From scaphoid fossa of sphenoid bone From scaphoid fossa of sphenoid bone and and cartilaginous part of auditory tube to soft cartilaginous part of auditory tube to soft

palate.palate.

Tenses soft palate.Tenses soft palate.

OropharynxOropharynxLevator veli palatini:Levator veli palatini:

From petrous temporal bone and From petrous temporal bone and cartilaginous part of auditory tube to soft cartilaginous part of auditory tube to soft palate.palate.

Elevates soft palate.Elevates soft palate.

UvulaUvula