Facial recess or the posterior sinus is bounded by -
Medially by the vertical part of VII nerve
Laterally by the chorda tympani
Above by the fossa incudis
All of the above
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)