小脳圧排の方向と蝸牛，前庭神経損傷の起こり方の相関関係について

Relationship between Directions of Cerebellar Retractions and Cochlear and Vestibular Nerve Injuries

I．はじめに

　小脳橋角部における不用意な小脳圧排によって，蝸牛神経損傷が起こりうることは良く知られている^6）．しかし，蝸牛神経と並走するもう一つの神経，前庭神経の手術操作に伴う損傷については，これまで言及されていない．本研究では，小脳圧排の方向と，それによって引き起こされる蝸牛神経，前庭神経の損傷の相関関係につき実験的に検討した．

It is said that lateral-to-medial retraction of the cere-bellar hemisphere is hazardous because, by this retrac- Lion, avulsion injury of the cochlear nerve and internal auditory artery may be caused. Caudal-to-rostral retrac-tion of the cerebellar hemisphere is, therefore, recom-mended in operations in the CP angle such as micro-vascular decompression procedures.

From the results of our present study, however, it can be said cauclal-to-rostral retraction can easily cause vestibular nerve damage. However, rostral-to-caudal re-traction may damage the cochlear nerve just as lateral-to-medial retraction does.