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Dissection of left ear from superior aspect

Tympanic cavity and labyrinth, superolateral view

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Image #61-3
Bassett Image
Diagram Image
Legend Image
Dissection of left ear from superior aspect
Tympanic cavity and labyrinth, superolateral view
  1. Dissected area on posterior aspect of petrous part of temporal bone
  2. Common crus
  3. Upper pointer: Subarcuate fossa Lower pointer: Vestibule (membrane of utricle visible)
  4. Facial nerve (VII)
  5. Upper (utriculoampullar) division of vestibulocochlear nerve (VIII)
  6. Cochlea (pointer on modiolus)
  7. Geniculate ganglion
  8. Greater superficial petrosal nerve
  9. Upper pointer: Tendon of tensor tympani muscle Lower pointer: Position of anterior process of malleus
  10. Lessor superficial petrosal nerve
  11. Communicating branch between above nerve (10) and plexus along middle meningeal artery
  12. Middle meningeal artery (cut off)
  13. Semilunar ganglion (reflected laterally)
  14. Lateral semicircular canal
  15. Superior semicircular canal
  16. Tympanic antrum
  17. Posterior ligament of incus
  18. Upper pointer: Long crus of incus Lower pointer: Body incus
  19. Fold of incus
  20. Capitulum of malleus
  21. Lateral margin of tympanic cavity
  22. Mastoid cells