Close-up view of the preceding step in the dissection. The lateral geniculate body is sectioned horizontally, lamination within the nucleus being visible. The superior quadrigeminal brachium (11), connecting the optic tract to the superior colliculus, appears as an inconspicuous white band along the posterior margin of the cut section. The medial geniculate body is also cut across in a horizontal plane. The course of the inferior quadrigeminal brachium (26) towards this nucleus is partially hidden by its passage beneath the superior quadrigeminal brachium. The H fields in the subthalamic region (21) are not readily demonstrated by gross dissection although the fibrous nature of the area is apparent in the view. (The red nucleus lies immediately beneath this area.)