Here's what rhymes with fasciculus.

Consider these alternatives

ambiguus / whose arcuate / late periventricular / ventricular spinothalamic / dynamic gluteal / deal mammillary / very geniculate / perigeniculate cerebrum / from ventromedial / medial subthalamic / dynamic medial / remedial pterygopalatine / line solitarius / ideas cumene / mean thalamic / dynamic