A shallow groove, sometimes double, leading lateralward and backward to an oblique opening, (Bristle in hiatus of facial canal labeled at upper right.).
The facial canal (Canalis nervi facialis), also known as the Fallopian Canal, first described by See also. Facial nerve · Prominence of the facial canal · Hiatus of the facial canal.
hiatus canalis facialis. the opening on the anterior aspect of the petrous part of the temporal bone that leads to the facial canal and gives passage to the greater petrosal nerve. A hiatus of the canal for the greater petrosal nerve.