Stylomastoid foramen Last edited and medically reviewed by Alaric Steinmetz on 03.01.2024 The stylomastoid foramen is a bony opening behind the Styloid process of the Temporal bone.AnatomyThe stylomastoid foramen is located between the Processus mastoideusCanalis nervi facialisArteria stylomastoideaNervus facialisFigure Enlarge Schematic illustration of the left temporal bone viewed from inferiorly. Figure adapted from Gray's Anatomy, Figure 141.