Neuroanatomy, Corticospinal Cord Tract

Excerpt

The corticospinal tract, AKA, the pyramidal tract, is the major neuronal pathway providing voluntary motor function. This tract connects the cortex to the spinal cord to enable movement of the distal extremities. As the corticospinal tract travels down the brain stem, a majority of its fibers decussate to the contralateral side within the medulla then continues to travel down the spinal cord to provide innervation to the distal extremities and muscle groups. Various collateral pathways exist which do not follow this pathway, leading to variability amongst individuals. This structure continues to develop after birth, with maturation taking place during puberty, due to rising levels of androgens. Clinically, the corticospinal tract is important in ischemic infarcts, rehabilitation, and various neurodegenerative disorders.