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Infra temporal fossa

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Infra temporal fossa

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Infra temporal fossa

  1. 1. Dr.Anitha NancyT,Asst. professor, Department ofAnatomy
  2. 2. Infratemporal fossa  Location  Boundaries  Contents  Maxillary artery & its branches
  3. 3. Boundaries: Lateral=Ramus of Mandible Anterior=Maxilla Medial=Lat. Pterygoid Plate Roof=Sphenoid Temporal Maxilla Parietal Sphenoid Frontal Z Lat. Pterygoid Plate Pterygomaxillary Fissure Infratemporal Fossa Temporal Fossa
  4. 4. Infratemporal Fossa
  5. 5.  Anterior: Maxilla.  Superior: Greater wing of sphenoid.  Medial: Lateral pterygoid plate.  Lateral: Coronoid process and ramus of mandible.
  6. 6.  Inferior: Continuous with neck.  Posterior: TMJ and styloid process.
  7. 7. COMMUNICATIONS: 1. With temporal fossa: through a gap deep to zygomatic arch 2. With cranial cavity: through foramen ovale, foramen spinosum, foramen lacerum 3. With orbit: through inferior orbital fissure 4. With pterygopalatine fossa: through pterygomaxillary fissure
  8. 8.  Mandibular nerve.  Maxillary artery.  Pterygoid plexus of vein  Medial and lateral pterygoid muscles.  Lower part of temporalis muscle.  Chorda tympani nerve.  Otic ganglion.
  9. 9. Temporalis Masseter Medial PterygoidBuccinator* Lateral Pterygoid
  10. 10. Elevate mandible EXCEPT  Lateral pterygoid Protrude mandible EXCEPT  Temporalis Are supplied by anterior division of mandibular nerve EXCEPT  Medial pterygoid
  11. 11. Inferior alveolar n. Lingual n. Facial n.. Submandibular ganglion. Otic ganglion. Lesser petrosal n. Chorda tympani Auriculotemporal n.
  12. 12. Ext. Cartotid Inf. AlveolarPost. Sup. Alveolar Maxillary Post. DeepTemporal Ant. DeepTemporal Infra-orbital Ext. Cartotid Post. Deep Temporal Ant. DeepTemporal Middle Meningeal Septal brr. Descending palatine Greater palatine Lesser palatine Sphenopalatine V3
  13. 13.  Terminal branch of external carotid artery.  Divided into 3 parts by lateral pterygoid muscle: Artery may pass superficial or deep to muscle.
  14. 14.  First part: Origin to lower margin inferior to lateral pterygoid.  Second part: Superficial or deep to inferior lateral pterygoid.  Third part: Lies within pterygopalatine fossa.
  15. 15. Deep auricular: Lies within parotid gland. Supplies TMJ, ext. aud. Meatus, outer surface of ear drum.
  16. 16. Anterior tympanic: Arises within parotid gland. Supplies tympanic cavity and inner surface of ear drum.
  17. 17. Middle meningeal: Enters cranial cavity via foramen spinosum. Supplies skull and dura mater.
  18. 18. Accessory meningeal: Enters cranial cavity via foramen ovale. Supplies semilunar ganglion (CN V) and dura mater.
  19. 19. Inferior alveolar: Enters mandibular foramen. Supplies lower teeth and gums. Passes through mental foramen and becomes mental artery.
  20. 20. Branches to muscles of mastication. Buccal artery.
  21. 21. Posterior superior alveolar: Runs with superior alveolar nerve (CN V-2). Supplies upper molars and premolars.
  22. 22. Infraorbital: Enters orbit via inferior orbital fissure. Runs with infraorbital nerve. Supplies lower eyelid, side of nose, upper lip, oral mucosa. Gives rise to anterior and middle superior alveolar arteries.
  23. 23. Descending palatine: To soft and hard palates. Terminal branch. Artery of pterygoid canal: To pharynx and auditory tube.

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