1. Answer: C. The suprachiasmatic nucleus utilizes retinal input to control circadian rhythms in part by influencing the pineal to cyclically produce serotonin and melatonin.
2. Answer: D. The medial geniculate nucleus is involved in auditory processing.
3. Answer: C. Lesions of the arcuate nuclei may result in increased prolactin output from the adenohypophysis due to a loss of an inhibitory influence from dopaminergic cells in the arcuate nuclei.
4. Answer: D. The fullness or satiety center of the diencephaJon is the ventromedial nucleus of the hypothalamus.
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