Fig. 2From: Mastoid notch as a landmark for localization of the transverse-sigmoid sinus junctionOuter surface of the cranial base. On the medial side of the mastoid process, the mastoid notch extends superomedially to end up as the top of the notch. MP: mastoid process; MN: mastoid notch; TMN: top of the mastoid notch; EAM: external auditory meatusBack to article page