Quantitative data representing counts angle of orientation measurements length estimates and brain area volume estimates. Counts angles and lengths are for axons from the locus coeruleus visualized using antibodies directed against dopamine beta-hydroxylase or the norepinephrine transporter with 33'-diaminobenzidine HCl as a chromogren. Data was collected from tissue sections containing the primary and secondary visual cortices of adult macaque monkeys. Stereological data were collected using the StereoInvestigator software suite from MBF Biosciences (versions 2019 and 2020).