Corticopontine projections from the cingulate cortex in the rhesus monkey.

The corticopontine projections of the cingulate cortices were investigated in the rhesus monkey with the use of autoradiography. A well-organized topography of projections was observed with anterior cingulate cortex projecting to the medial part of the pontine gray matter and posterior cingulate cortex projecting to the lateral part. Together these projections form a circle of termination around the periphery of the pontine gray matter.