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       Posterior wall lies close to the mastoid air cells & presents the features from above downwards.

     1)      Aditus: Superiorly, an opening through which attic communicates with antrum.

     2)      Fossa incudes: A depression, lodges short process if Incus.

     3)      Pyramid: a bony projection through the summit of which appears the tendon of stapedius muscle to get attachment to the neck of Stapes.

 

                        

 

     4)      Facial recess: A depression lateral to the pyramid. It is bounded by-

              Medially: vertical part of facial nerve.

              Laterally: Chorda tympani.

              Above: Fossa incudes.

SURGICAL IMPORTANCE: Direct access can be made through this into middle ear without disturbing posterior canal wall.

RELATION OF FACIAL NERVE IN THE ABOVE WALL: The vertical portion of facial nerve courses down the posterior wall lateral to the pyramid to its exit in the Stylomastoid foramen.

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