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Medical Definition of Fasciculus lateralis proprius
1. Flechsig's fasciculi or ground bundles (f. Anterior proprius and fasciculus lateralis proprius or lateral ground bundle); intersegmental fasciculi; ascending and descending association fibre systems of the spinal cord which lie deep in the anterior, lateral, and posterior funiculi adjacent to the gray matter. Synonym: ground bundles, intersegmental fasciculi, proper fasciculi. (05 Mar 2000)