the retino-receptive layers of anteroventral optic tectum ( avt ) differed ultrastructurally from those of posterodorsal tectum ( pdt ) with respect to the thickness of horizontal dendrites in layer 2-3 , the size of optic terminals in layers 2-7 , and the number of synaptic contacts per terminal .
C0228405
optic tectum
C0039433
tectum