Title: Neuronavigator-assisted study of Anatomy of Internal Auditory Canal and Facial Nerve Canal
Abstract: Objectives To explore the effect of neuronavigation system on the anatomy research of internal auditory canal (IAC) and facial nerve canal (FNC), and to provide the anatomic basis for safely opening IAC during the surgery through retrosigmoid approach and protecting FNC during the surgery through transpetroal approach. Methods Neuronavigator-assisted disection through retrosigmoid and transpetroal approaches was performed in 8 adult cadaver heads to expose IAC and FNC. The fiducial error was determined. The anatomy of the IAC and FNC, and their relationship with the structures around them were observed and measured. Results ①The mean fiducial error was less than 0.9mm. ②The distance from the posterior inferior edge of internal ear port to the central point of the posterior edge of the sigmoid sinus was (32.15 1.76)mm on the left, and (33.34 1.57)mm on the right; the distance from the posterior inferior edge of internal ear port to the posterior edge of the posterior semicircular canal was (12.51 2.15)mm on the left, and (13.26 2.44)mm on the right. ③The FNC was divided into 3 sections, i.e. labyrinthine one (length, 3.6mm 1.2mm; diameter, 1.2mm 0.3mm) tympanic one (length, 11.2mm 2.5mm; diameter, 1.4mm 0.1mm) and mastoid one (length, 16.1mm 3.6mm; diameter, 1.7mm 0.2mm). Conclusions Neuronavigation system is helpful to opening the IAC and protecting for FNC. The familar microanatomy of the IAC, FNC and related structures is essential to protecting important structures during the microsurgical resection of acoustic neuromas through retrosigmoid and transpetrosal approaches.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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