Arcuate eminence

The arcuate eminence is a rounded  prominence upon the superior surface of   the petrous part of the temporal bone forming the lateral part of the posterior wall of  the middle cranial fossa.   The arcuate eminence indicates the position of the underlying   superior semicircular canal (anterior semicircular canal).  

The groove for the greater petrosal nerve is situated anteromedially to the arcuate eminence.