in the present study , in which 15 day old mice were used , the lesions in the retinal neurons and the constant involvement of only the contralateral superior colliculus left little doubt that the primary spread of the virus , even in these very young animals , must have occurred within the retinal neuron processes ( axons ) which decussate in the optic chiasm ( in the mouse , as in the rat , very few of these go to the homolateral side ) and synapse chiefly with the neurons of the contralateral superior colliculus and also , apparently to a lesser extent , with those of the contralateral external geniculate body , where lesions were also demonstrated .
C0004461
axons
C0027882
neurons