The nervus intermedius as a variable landmark and critical structure in cerebellopontine angle surgery: an anatomical study and classification

Acta neurochirurgica
Alex AlfieriChristian Strauss

Abstract

An understanding of the normal topography during cerebellopontine angle surgery is necessary to obviate the anatomical distortions caused by tumors. The aim of this study was to analyze the morphological features of the nervus intermedius (NI) and its related structures in the cerebellopontine angle (CPA). Forty-three isolated human brainstems were examined to collect comprehensive morphometric and topographical data of the NI in its course from the brainstem to the ganglion geniculi, and discover its anatomical relationship with the other neurovascular structures in the CPA as well as within the meatus acusticus internus. A total of 84 NI were analyzed. The number of bundles comprising the NI varied from one to five. The mean length of the cisternal segment of the NI was 11.47 mm. In most cases, a vein between the root entry/exit zones of the facial and the vestibulocochlear nerve (VN) was documented. In all cases the NI joined the facial nerve, typically (85 %) distally to the the porus within the meatus acusticus internus. The entry/exit zone of the NI can be categorized into four types: in type A, they arise directly from the brainstem; in type B, they arise solely from the facial nerve; in type C solely from the VN; and in...Continue Reading

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Citations

Mar 22, 2013·Journal of Multidisciplinary Healthcare·Bruno Bordoni, Emiliano Zanier
Jul 6, 2015·Acta neurochirurgica·Masafumi FukudaYukihiko Fujii
Feb 15, 2015·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Francesco Sala
Feb 7, 2015·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Julian PrellStefan Rampp
Aug 11, 2018·Journal of Neurosurgery·Maria Peris-CeldaMichael J Link
Jan 31, 2014·Journal of Clinical Nursing·Maija RantalaPäivi Kankkunen
Dec 15, 2019·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·William E CliftonRobert E Wharen
Sep 16, 2019·Neurosurgical Review·Felipe ConstanzoRicardo Ramina
Jan 9, 2021·Journal of Neurological Surgery. Part A, Central European Neurosurgery·Julian PrellStefan Rampp

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