The Oral CavityThe Oral Cavity

R. Shane Tubbs, MS, PA-C, R. Shane Tubbs, MS, PA-C, PhDPhD

TeethTeeth

►32 adult/20 32 adult/20 “milk” teeth“milk” teeth

►Medial/Medial/lateral lateral incisorincisor

►CanineCanine►2 premolars2 premolars►3 molars 3 molars

Tooth InnervationTooth Innervation

Hard PalateHard Palate►Palatine process Palatine process

maxillary bonemaxillary bone►Horizontal plate Horizontal plate

palatine bonepalatine bone►> (3> (3rdrd molar), < molar), <

palatine foraminapalatine foramina► Incisive foramenIncisive foramen

►Lingual nerve Lingual nerve crosses the crosses the submandibular submandibular duct twice!duct twice!

Salivary GlandsSalivary Glands

MusclesMuscles►Tensor veliTensor veli►Levator veliLevator veli►PalatoglossusPalatoglossus►PalatopharyngeuPalatopharyngeu

ss►Musculus uvulaeMusculus uvulae

Extrinsic Tongue (L. lingua; G. Extrinsic Tongue (L. lingua; G. glossa) Musclesglossa) Muscles

►XII lesion: tongue deviates to XII lesion: tongue deviates to ipsilateral sideipsilateral side

Lymphatic DrainageLymphatic Drainage►Gingivae and all teeth less the Gingivae and all teeth less the

mandibular incisors drain into the mandibular incisors drain into the submandibular lymph nodessubmandibular lymph nodes

►Tongue:Tongue:

Tongue VeinsTongue Veins

►Return to IJ directly Return to IJ directly or indirectlyor indirectly

►Sublingual Sublingual absorptionabsorption

Tongue TopographyTongue Topography►Sulcus terminalisSulcus terminalis►Foramen cecumForamen cecum►Median sulcus and septumMedian sulcus and septum

PapillaePapillae►VallateVallate►Foliate: lateral and poorly Foliate: lateral and poorly

developed in humans; developed in humans; ►Filiform: touch receptors Filiform: touch receptors

(raspy); no taste buds(raspy); no taste buds►Fungiform: Fungiform:

TasteTaste►Tongue (Vallate, foliate, and Tongue (Vallate, foliate, and

fungiform)fungiform)►Soft palateSoft palate►Oral pharynxOral pharynx►EpiglottisEpiglottis

Taste (SVA)Taste (SVA)►Geniculate ganglion Geniculate ganglion ► Inferior ganglion IX Inferior ganglion IX ► Inferior ganglion X Inferior ganglion X

General SensationGeneral Sensation►GSA of lingual anterior 2/3GSA of lingual anterior 2/3►GVA of IX posterior 1/3GVA of IX posterior 1/3

LabLab