First-order neurons that transmit fast sensory information perceived as pain from the face synapse in which of the following?
A. Mesencephalic nucleus
B. Trigeminal ganglion
C. Reticular formation
D. Main sensory nucleus
E. Spinal trigeminal nucleus
ANS: E
Rationale: Central axons of Aδ neurons enter the pons, then descend as the spinal tract of the trigeminal nerve into the cervical spinal cord. These neurons synapse with second-order neurons in the spinal trigeminal nucleus. Axons of second-order neurons transmitting fast pain information cross the midline and ascend in the trigeminal lemniscus to the ventral posteromedial nucleus of the thalamus. Third-order neurons arise in the ventral posteromedial nucleus and project to the somatosensory cortex
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