Fig 5.

Histologic samples obtained in an 81-year-old man. CP indicates cerebral peduncle.

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

B–F, Continuous thin sections show a penetrating vessel from the perforation point in the subarachnoid space (B) to the largest PV space within the upper part of the OT (F). Its maximum height is 0.7 mm. Sections show the perforation point through the OT, which corresponds to the small arrows in Figure 2. A few small PV spaces (arrowheads) are visible along the OT (myelin staining, original magnification ×25). Bracket in E = 1 mm.