Fig. 6

SMCT image and sensory and motor fibers of the trigeminal nerve. A Anatomy of the sensory and motor roots of the trigeminal nerve. The motor fibers of the trigeminal nerve travel beneath the sensory fibers. B Schwannomas arising from the sensory fibers of the trigeminal nerve exert downward pressure on the motor fibers of V3 due to gravity, leading to partial motor function impairment and subsequent atrophy of the masticator muscles. C Schwannomas arising from the motor fibers of the trigeminal nerve result in directly impaired motor function and consequent masticator muscle atrophy. D Meningiomas positioned at the base of the MC are less likely to compress the motor fibers of the trigeminal nerve