Infratemporal fossa - nervous structures


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Infratemporal fossa - nervous structures

  1. 1. Infratemporal Fossa Nervous Structures Kristine Joy Leyva DMD1-A
  2. 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. 3. Anterior Division: Masseteric anterior to TMJlaterallysuperior to and posterior of temporalislateralpterygoid M. mandibular notch small branch to TMJ
  4. 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. 5. Anterior Division: Buccal descends alonganterior lower part ofbetween 2 temporalisheads of lateralpterygoid mucous supply skin of membrane buccinator gingiva along mandibular molars
  6. 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. 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. 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. 9. Posterior Division: Mylohyoidbranch form descends in aI.A.N groove on deep side of ramus superficial surface of Mylohyoid M.
  10. 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. 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. 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. 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. 14. Parasympathetics of Parotid Gland
  15. 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. 16. NAME OF CELL BODY: inferior salivatory nucleusCHAR. OF CELL BODY: a collection of nerve cellbodies located in the medulla
  17. 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