**2.5 Vidian nerve**

The VN arises from the junction of the greater petrosal nerve and the deep petrosal nerve within the vidian canal, after which it merges with the PPG. Between V2 and V3, the VN lies, on average, 8.0 ± 1,2 mm below V2 and parallel to V2. The bony windows superior and inferior to the VN (between the VN and V2 and between the VN and the superior wall of the pharynx) are the corridor to the posterior SphS [5].
