two , non-mutually exclusive , explanations for the presence of a corticotectal pathway in the absence of mature cell properties in the superior colliculus are most apparent : ( a ) corticotectal synapses are incompletely formed at birth and require many weeks to develop , and ( b ) corticotectal cells are immature during early postnatal life and can not impress adult-like characteristics upon the superior colliculus cells until they , themselves , 'mature ' .
C0007634
cell
C0039062
synapses