Cerebral Peduncles

The cerebral peduncles are two large bands of white matter composed of axons which descends from upper motor neurons in the frontal lobes of the cerebral cortex which emerge from the underside of the cerebral hemispheres. The cerebral peduncles approach each other as they enter the rostral border of the pons. The important fibers running through the cerebral peduncles include the corticospinal tract and the corticobulbar tract, among others.