The pyramidal tracts include both the corticospinal and corticobulbar tracts. These are aggregations of upper motor neuron nerve fibres that travel from the cerebral cortex and terminate either in the brainstem or spinal cord and are involved in control of motor functions of the body.

The myelination of the pyramidal fibres is incomplete at birth and gradually progresses in caudo-cranial direction and thereby progressively gaining functionality. Most of the myelination is complete by two years of age and thereafter it progresses very slowly in cranio-caudal direction up to twelve years of age.

Esta definição inclui textos do site wikipedia – Wikipedia: enciclopédia libre (22 de julho de 2004). FL: Wikimedia Foundation, Inc. Recuperado no dia 10 de agosto de 2004, de


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