part of cerebral peduncle basis pedunculi cerebri 2010-05-12T01:09:11Z BTO:0004677 BrendaTissueOBO The large bundle of nerve fiber tracts forming the anterior part of the cerebral peduncles, which consists of corticospinal, corticonuclear, corticopontine, parietotemporopontine, and frontopontine fibers descending from the cerebral cortex and terminating in the pons and spinal cord. base of cerebral peduncle crus cerebri mgr