part of basal forebrain diagonal band A band of nerve fibers that forms the caudal zone of the anterior perforated substance where it adjoins the optic tract, which is continuous caudolaterally with the periamygdaloid area and rostromedially passes above the optic chiasm to blend with the paraterminal gyrus. BTO:0002445 BrendaTissueOBO Broca's diagonal band band of Broca bandaletta diagonalis (Broca) diagonal band of Broca stria diagonalis stria diagonalis (Broca)