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geniculate nucleus

any of four small oval clusters of nerve cell bodies on the underside of the thalamus in the brain. There are two pairs—the lateral geniculate nuclei and the medial geniculate nuclei—with one of each pair on either lobe of the thalamus; these relay, respectively, visual impulses and auditory impulses to the cerebral cortex. Also called geniculate body.

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Psychology term of the day

May 26th 2024

metachromatic leukodystrophy

metachromatic leukodystrophy

an autosomal recessive disorder (see recessive allele) characterized by deficiency or absence of the enzyme arylsulfatase A, which results in loss of myelin in the nervous system and accumulation of cerebroside sulfate (a type of myelin lipid) within the white matter of the central nervous system. Loss of motor function and deterioration in mental ability most commonly develop after the 1st year of life (late infantile form), but symptoms may also appear between 3 and 10 years of age (juvenile form) or around age 30 (adult form).