basis pedunculi cerebri

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 [ba´sis] (pl. ba´ses) (Gr.)
the lower, basic, or fundamental part of an object, organ, or substance. Anatomic nomenclature for the base of a structure or organ, or the part opposite to or distinguished from the apex.
basis pedun´culi ce´rebri the large bundle of nerve fiber tracts forming the ventral part of the cerebral peduncles, consisting of corticospinal, corticonuclear, corticopontine, parietotemporopontine, and frontopontine fibers descending from the cerebral cortex and terminating in the pons and spinal cord. Called also crus cerebri.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.