[Applied anatomy of abut structures of internal auditory meatus (IAM) through middle cranial fossa approach].

OBJECTIVE: To provide anatomical basis for operation of internal auditory meatus(IAM). Correlation structures with IAM were measured according to sign of hiatus of facial nerve. METHOD: These structures include spinous foramen, superficial geater petrosal nerve, superficial lesser petrosal nerve, hiatus of facial nerve were measured on 24 wet cranial bone (48 sides). RESULT: It is demonstrated that 8.3% geniculate ganglion and labyrinth segment of facial nerve Variation which distance from hiatus of facial nerve to geniculate ganglion is distinct. CONCLUSION: Our data will be very holpful for location of IAM during operation via middle cranial fossa approach.