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Infratemporal fossa - nervous structures
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Infratemporal fossa - nervous structures

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  • 1. Infratemporal Fossa Nervous Structures Kristine Joy Leyva DMD1-A
  • 2. I. Mandibular Nerve - largest of the 3 divisions of CN V - Mixed nerve - large sensory and small motor root that unite after passing through foramen ovale to enter infratemporal fossa
  • 3. Anterior Division: Masseteric anterior to TMJlaterallysuperior to and posterior of temporalislateralpterygoid M. mandibular notch small branch to TMJ
  • 4. Anterior Division: Anteriorand Posterior Deep Temporalsuperior to lateral pterygoid M.;between skull and temporalis; passdeep to muscle it innervates Anterior Division: Medial Pterygoid enters deep surface of muscle
  • 5. Anterior Division: Buccal descends alonganterior lower part ofbetween 2 temporalisheads of lateralpterygoid mucous supply skin of membrane buccinator gingiva along mandibular molars
  • 6. Posterior Division: Auriculotemporal runs posteriorly, inferior to arise from 2 lateral pterygoid rootssuperiorly between medial aspect ofauricle and condyle neck of mandibleof mandible deep toparotid glandascends over divides to superficialzygomatic arch temporal branches
  • 7. Posterior Division: Lingualinferior to lateralpterygoid and joins Chordamedial and Tympanianterior to I.A.N. between medial oral cavity pterygoid and ramus of mandible
  • 8. Posterior Division: Inferior Alveolar inferior todescends with lateralinferior alveolar pterygoidartery between sphenomandibular ligament and ramus of INNERVATES: lower mandible teeth and gingiva from premolars anteriorly to midline mandibular foramen
  • 9. Posterior Division: Mylohyoidbranch form descends in aI.A.N groove on deep side of ramus superficial surface of Mylohyoid M.
  • 10. II. Maxillary Nerve: Posterior Superior Alveolar Nerve infratemporal fossa (onpterygomaxillary posterior surface offissure maxilla along maxillary tuberosity) enter posterior surface of maxilla gingival branch innervate maxillary sinus and molars
  • 11. III. Chorda Tympani SOURCE: branch from facial n. in tympanic cavitypreganglionic enter tympanic cavitysympathertic fibers tosubmandibular ganglion and lies alongand taste fibers to tympanic membraneanterior 2/3 of tongue and malleusjoins lingual nervein infratemporal petrotympanic fissurefossa
  • 12. IV. Lesser Petrosal SOURCE: tympanic plexus along promontory of the ear and re-forms as lesser petrosal nerve middle ear preganglionic parasympathetic and postganglionic parasympathetic to cavity parotid gland foramen ovale groove for lesser petrosal n.infratemporalfossa joins otic ganglion
  • 13. V. Otic GanglionPostganglionic auriculotemporalparasympathtic branch (CN V)fibers parotid glandCHARACTERISTICS OF CELL BODY: a collection ofnerve cell bodies; located in infratemporal fossa;small stellate-shaped ganglion; located inferior toforamen ovale, medial V₃
  • 14. Parasympathetics of Parotid Gland
  • 15. I. Preganglionic Neuron Preganglionic Inferior salivatory parasympathetic nucleus in medulla fibers jugular glossopharyngeal foramen N.Glossopharyngeal tympanic tympanic n. branch of IX plexus otic ganglion lesser petrosal nerve
  • 16. NAME OF CELL BODY: inferior salivatory nucleusCHAR. OF CELL BODY: a collection of nerve cellbodies located in the medulla
  • 17. II. Postganglionic Neuronpostganglionic otic ganglionparasympatheticfibers parotid gland auriculotemporal branch (CN V)NAME OF CELL BODY: otic ganglionCHAR. OF CELL BODY: a collection of nerve cellbodies; small stellate-shaped ganglion; locatedinferior to foramen ovale, medial V₃

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