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Microsurgical Anatomy of the Region near the Porus Acusticus Internus; Arteries around the facial and acoustic nerves bundle Toshio MATSUSHIMA 1 , Tooru INOUE 1 , Yoshihiro NATORI 1 , Masashi FUKUI 1 , Evandro de OLIVEIRA 2 , L Albert 3 1Department of Neurosurgery, Neurological Institute, Faculty of Medicine, Kyushu University 2Instituto Neurologico de San Paulo 3Department of Neurological Surgery, University of Florida Keyword: Porus acusticus internus , Cranial nerves VII and VIII , Internal auditory artery , Subarcuate artery , Microsurgical anatomy pp.409-415
Published Date 1992/4/10
DOI https://doi.org/10.11477/mf.1436900437
  • Abstract
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 The microsurgical anatomy of the cerebellopontine cistern around the porus acusticus was studied under the surgical microscope, using the heads of 20 cadavers. The relationships among the porus acusticus, facial and acoustic nerves, and neighboring arteries were noted carefully. The arteries were the meatal loop of the cerebellar artery, the internal auditory artery (I. A. A.), the subarcuate artery (S. A.), and the perforating artery (P. A.). The cerebellar arteries made the meatal loop and the arterialnerve complex while they passed in front of the porus acusticus. Most of the cerebellar arteries were the main or rostral trunk of the AICA. The I. A. A. supplying the facial and acoustic nerves usually originated from the meatal segment of the cerebellar artery and ran into the anterior part of the porus acusticus to enter the internal auditory canal. The S. A. penetrating the subarcuate fossa made a common trunk with I. A. A. or branched from the cerebellosubarcuate artery. One recurrent P. A., a special type of the P. A., was usually present on each side. Since the artery ran between the nerve bundles of the facial and acoustic nerves, it could not be seen through the lateral suboccipital approach.


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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