FIG 6. View in cadaver 2 was obtained after the sagittal removal of the right hemisphere in the plane of the third ventricle. Image shows the course of the microcatheter (white arrow) that penetrates the floor of the ventricle. The dorsum sella (white square) and third cranial nerve (black arrow) are also shown. The brain stem and basilar artery are reflected posteriorly, and the course of the catheter in the subarachnoid space is shown.