Figure 3: The motor root and sensory root of trigeminal nerve were attached together as one unit, and the motor root was on the ventral side. The pontine perforating artery was close to the nerve. b After the dissection of arachnoid adhesions, the superficial lateral pontine vein was found to compress the motor root of trigeminal nerve. c Pontine perforating artery was detached away from the nerve. d All of the offending vessels were separated from the nerve by Teflon graft.