Figure 3.

Tracer distribution over the SAS and cisterns of the rat brain. Sections were stained for laminin (pink) and cell nuclei (blue). Tracer is shown in green. Panel A: Coronal section of a rat brain at approximately 5.6 mm posterior to the bregma showing some of the major cerebral cisterns. In the left upper corner a miniature of the whole section. Tracer was present along the cleft (*) between the hippocampus and the medial geniculate nucleus (MG). This space connected the interpeduncular cistern (IPCi) at the base of the brain, with the ambient cistern (ACi) and the quadrigeminal cistern (QCi). Arteries and veins followed the outline of these cisterns and were embedded in tracer. Panels B and C: horizontal sections of the rat brain at approximately −7 mm from the bregma. The stars show the presence of an extension of the interpeduncular cistern that connects the SAS with the lateral ventricle (LV). The tracer was observed along this tract, which followed the outline of the hippocampus (Hi) up to the lateral ventricle. Scale bar represents 1 mm.