in taxon results in morphogenesis of anatomical structure morphogenesis central nervous system projection neuron axonogenesis corticospinal tract morphogenesis GO:0021957 corticospinal tract axonogenesis CST axonogenesis Generation of a long process of a pyramidal cell, that carries efferent (outgoing) action potentials from the cell body in cerebral cortex layer V towards target cells in the gray matter of the spinal cord. This axonal process is a member of those that make up the corticospinal tract. Bilateria corticospinal tract