It had a short face, a delicate Premaxilla with only one or two incisors and the lateral rim of the internal auditory meatus was lengthened towards the brain case which formed a longitudinal ridge. Tumor position was classified relative to the meatus of the porus acousticus, and pre-operative hearing was dichotomized to salvageable hearing (Gardner. Figure 1 shows the system with the blood supply shown in red. The relationships among the porus acusticus, facial and acoustic nerves, and neighboring arteries were noted carefully. We mention that artery because it is the blood supply for the inner ear, which includes hearing and vestibular (balance) systems. The microsurgical anatomy of the cerebellopontine cistern around the porus acusticus was studied under the surgical microscope, using the heads of 20 cadavers. Nerve to glands of nose and palate (motor fibers to levator palati muscles) 14.Minor petrosal nerve anastamosis 15. Vascular loops are anatomical anomalies of the anterior inferior cerebellar artery (AICA). Results: The ratio of area of the porus acousticus internus to facies posterior partis petrosa was 4.82 on the right and 4.54 on the left. Blood supply to peripheral auditory-vestibular system. The posterior wall length of internal acoustic meatus vertical and sagittal diameter of the porus were also measured. It arises from bipolar cells in the vestibular ganglion, ganglion of Scarpa, which is situated in the upper part of the outer end of the internal auditory meatus. porus acousticus internus to facies posterior was calculated. It emerges from the pons and exits the inner skull via the internal acoustic meatus (or internal auditory meatus) in the temporal bone. "Examination of the skull revealed a schwannoma arising from the vestibular nerve, near the porus acusticus, extending into both the internal auditory meatus. The vestibular Schwannomas grow slowly at the inner entrance of the internal auditory meatus (meatus acousticus internus). Internal auditory meatus (meatus acusticus internus)
Internal auditory meatus, a canal in the temporal bone of the skull that carries nerves from inside the cranium towards the middle and inner-ear compartments. Internal acoustic meatus (or internal auditory meatus) There are two internal auditory meatus in most individuals, one on the left side of the skull and one on the right.īöttcher's ganglion: Ganglion on the cochlear nerve in the internal auditory meatus.
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