An anatomical assessment of the supracerebellar midline and paramedian approaches to the inferior colliculus for auditory midbrain implants using a neuronavigation model on cadaveric specimens

作者：Vince Giles H^*; Herbold Christian; Coburger Jan; Westermaier Thomas; Drenckhahn Detlev; Schuetz Ansgar; Kunze Ekkehard; Solymosi Laszlo; Roosen Klaus; Matthies Cordula

来源：Journal of Clinical Neuroscience, 2010, 17(1): 107-112.

DOI：10.1016/j.jocn.2009.06.034

• Cerebellopontine angle
• Inferior colliculus
• Neural deafness

The inferior colliculus (IC) is an alternative site for electrode placement in neural deafness due to its surgical accessibility and its well-known tonotopic stratification. In patients where tumor surgery has already occurred and the cerebellopontine angle contains scar tissue or tumor-remnants, midline and paramedian supracerebellar approaches are alternative routes. They are often avoided due to concerns regarding the venous drainage of the cerebellum, the electrode trajectory and the course of the electrode cable. We studied these surgical routes in five neuronavigated fixed cadaveric specimens. For paramedian and midline approaches, the transverse sinus was exposed 5.8 mm on average. A mean of 1.6 cerebellar veins, with an average diameter of 2.0 mm, draining to the tentorium were transected to reach the tentorial notch. Only 0.4 arterial branches were met. We conclude that the supracerebellar midline and paramedian approaches provide a good exposure of the IC and offer safe and viable alternative routes to the IC. Additionally, they provide a wider angle of action for optimal electrode placement.

• 出版日期2010-1