Distribution of cytochrome oxidase in layers IV and V of the striate cortex in neonate monkeys.

The uniformly dense staining for cytochrome oxidase (CO) in layer IV of area 17 in adult monkeys has been described as developing from a bilaminar pattern in neonates being composed of a broad CO band in layer IV alpha and a narrow CO band attributed to the innermost zone of layer IV beta. Here we present evidence, in the neonate marmoset monkey, for the narrow CO band to be localized in the outermost rim of layer V, designated as sublayer Va.