First-order neurons conveying discriminative touch information from the face synapse in which of the following?
A. Ciliary ganglion
B. Trigeminal ganglion
C. Main sensory nucleus of the trigeminal nerve
D. Ventral posteromedial nucleus of the thalamus
E. Mesencephalic nucleus
ANS: C
Rationale: The main sensory nucleus of the trigeminal nerve is the site of synapse for first-order neurons conveying discriminative touch information from the face. The ciliary ganglion is the site of synapse for parasympathetic neurons innervating the ciliary muscle that increases the curvature of the lens in the eye. The trigeminal ganglion contains cell bodies of first-order neurons conveying somatosensory information from the face. The ventral posteromedial nucleus of the thalamus is the site of synapse between second and third-order neurons conveying somatosensory information from the face to the cerebral cortex. The mesencephalic nucleus receives proprioceptive information from the muscles of mastication.
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