Facial recess or the posterior sinus is bounded by -
Facial recess or Posterior sinus – It is a depression in the posterior wall of the middle ear.
It is bounded by:
Medially – Vertical part of VIII nerve
Laterally – Chorda tympani
Above – Fossa incudis
Importance – This recess is important surgically, as direct access can be made through this into the middle ear without disturbing posterior canal wall. (Posterior tympanotomy approach)
Medially by the vertical part of VII nerve
Laterally by the chorda tympani
Above by the fossa incudis
All of the above