since the region of the tectum which is first innervated by retinal fibers corresponds to the projection field of the region around the upper end of the choroid fissure where the first ganglion cells are generated , it would appear that the axons of the first-formed ganglion cells grow over the rostral surface of the tectum before establishing the first retino-tectal synapses near the central portion of the tectum .
C0228071
ganglion cells
C0017067
ganglion