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basis
(ba´sis)
pl. ba´ses
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 pedunculi cerebri
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.
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