part_of part of part of in lateral side of in_lateral_side_of extends_fibers_into head neuron projection bundle brain cranial neuron projection bundle cranial nerve fiber tract cranial nerve fiber bundle Any of the cranial nerves, or their central nervous system analogs (the optic tract, the epiphyseal tract). These analogs are not true nerves, and are instead evaginated sensory afferents emanating from the brain neuron projection bundle from brain cranial nerve or tract