start stage end stage mesencephalic nucleus of trigeminal nerve mesencephalic nuclei of trigeminal nerves ZFA:0000312 Sensory trigeminal nucleus located at the tectal ventricle near the synencephalon and optic tectum that contains large pyriform neurons. The sensory fibers of the large pyriform neurons that run peripherally in the trigeminal nerve. TAO:0000312 zebrafish_anatomy sensory trigeminal nucleus unknown adult