Generation of a long process of a CNS neuron, that carries efferent (outgoing) action potentials from the cell body in the optic tectum towards target cells in the premotor reticulospinal system in the hindbrain. [ http://www.ncbi.nlm.nih.gov/pubmed/15065115 http://www.ncbi.nlm.nih.gov/pubmed/17507550 http://www.ncbi.nlm.nih.gov/pubmed/8038988 GOC:dsf ]