the principal observations were that toxin binding sites are predominantly associated with central areas of the brain in direct receipt of sensory inputs ( the main and accessory olfactory bulbs , superior colliculus , ventral lateral geniculate nucleus , cochlear nuclei , the substantia gelatinosa of the spinal cord and spinal trigeminal nucleus , the principal sensory nucleus of the trigeminal , and the dorsal column nuclei ) and with limbic areas of the brain ( hippocampus , amygdala , olfactory tubercle , medial mammillary nucleus , and the dorsal tegmental nucleus of gudden ) .
C0041000
spinal trigeminal nucleus
C0006104
brain