The term area Tpt of Pandya refers to a cortical area located at the caudal extreme of the superior temporal gyrus and continues into the bank of the bounding lateral fissure in the macaque. Defined on the basis of cytomyeloarchitecture it forms the caudolateral boundary of the auditory cortex. It differs from the adjacent auditory area, area Kalt of Pandya, in that the cell density in the outer layers is not as great and the internal pyramidal layer (V) is not as light. Myelination is moderate ( Pandya-1973 ).