Fig 4.

Histologic samples obtained in an 86-year-old woman.

A, Section shows lines corresponding to sections in B–D.

B–D, Continuous thin sections show a penetrating vessel (arrow) from the perforation point at the subarachnoid space (B) to the largest PV space adjacent to the OT (C and D). Its maximum height is 0.5 mm. Sections show the perforation point medial to the OT, which corresponds to the large arrows in Figure 2. Small PV spaces (arrowheads) are present (myelin staining, original magnification ×25). CP indicates cerebral peduncle.