The internal auditory meatus provides a passage through which the vestibulocochlear nerve (CN VIII), the facial nerve (CN VII), and the labyrinthine artery (an internal auditory branch of the anterior inferior cerebellar artery in 85% of people) can pass from inside the skull to structures of the inner ear and face. The facial nerve continues traveling through the facial canal, eventually exiting the skull at the stylomastoid foramen. The cochlear and vestibular branches of cranial nerve VIII separate according to this schema and terminate in the inner ear. posterior inferior - inferior vestibular area (contains inferior division of vestibular nerve).posterior superior - superior vestibular area (contains superior division of vestibular nerve).anterior inferior - cochlear nerve area (contains cochlear nerve).anterior superior - facial nerve area (contains facial nerve and nervus intermedius).Non-schwannomatous tumors restricted to the internal auditory meatus (IAM) are rare and their preoperative radiological diagnosis may be difficult. An appropriate angle must be given in the sagittal plane (parallel to the brain stem). The glossopharyngeal, vagus, and spinal accessory nerves are seen. Plan the coronal slices on the axial plane angle the position block parallel to the line along right and left IAMS (as shown in the diagram).Check the positioning block in the other two planes. It is commonly a branch of the anterior inferior cerebellar artery. Usually, these lesions present typical CT and MRI findings. The facial nerve, nervus intermedius, and vestibulocochlear nerve can be observed coursing toward the opening of the internal auditory meatus in company with the labyrinthine artery, which supplies the inner ear. Internal auditory meatus definition, the canal extending through the petrous portion of the temporal bone, through which the glossopharyngeal nerve. Although there are three osseous canals, the fundus is conceptually divided more commonly into four quadrant areas according to the four major nerve branches of the inner ear: Vestibular schwannomas (VS) are the most common lesions of cerebellopontine angle (CPA) corresponding to 76-91 of the cases. House) then divides the upper passage into anterior and posterior sections. The falciform crest first divides the meatus into superior and inferior sections a vertical crest (Bill's bar, named by William F. The fundus is subdivided by two thin crests of bone to form three separate canals, through which course the facial and vestibulocochlear nerve branches. The lateral (outer) aspect of the canal is known as the fundus. The canal which comprises the internal auditory meatus is short (about 1 cm) and runs laterally into the bone. The internal auditory meatus, the endolymphatic foramen and the subarcuate fossa are obvious and the internal carotid artery and the VIIth (facial) cranial. Its outer margins are smooth and rounded. It is located inside the posterior cranial fossa of the skull, near the center of the posterior surface of the petrous part of the temporal bone. It contains an outer shell to cut the shape, an inner shell to stamp the.

The opening to the meatus is called the porus acusticus internus or internal acoustic opening. Auditory testing: An audiologist Enjoy premium sound quality or create music.