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Lissauer’s tract

Noun 1. A small strand situated in relation to the tip of the posterior column close to the entrance of the posterior nerve roots. (wikipedia.org) 2. A slender column of white matter between the dorsal gray column and the periphery of the spinal cord. (merriam-webster.com) Syn: fasciculus of Lissauer, tract of Lissauer, dorsolateral fasciculus, dorsolateral tract, zone of Lissauer, posterolateral...

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Lissencephaly

Noun Literally means smooth brain. 1. A rare brain formation disorder caused by defective neuronal migration during the 12th to 24th weeks of gestation resulting in a lack of development of brain folds (gyri) and grooves (sulci). It is a form of cephalic disorder. Terms such as ‘agyria’ (no gyri) or ‘pachygyria’ (broad gyri) are used to describe the appearance of the surface of the brain. (wikipedia.org) 2. A disorder characterized by smoothness (lack of folds and grooves) of the brain. (wiktionary.org) 3. Condition in which the brain is smooth owing to failure of development of cerebral gyri. (nanomedicine.com) Word origin: From Greek lissos,...

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