<prompt> Facial recess or the posterior sinus is bounded by:Medially by the veical pa of VII nerveLaterally by the chorda tympaniAbove by the fossa includisAll of the above  <response>: Facial recess or Posterior sinus - It is a depression in the posterior wall of the middle ear. It is bounded by: Medially - Veical pa of VIII nerve Laterally - Chorda tympani Above - Fossa incudis 