TRIP 2 #5 - We are now at the level of plane D in FIGURE 13-1 . The stria terminalis remains in its expected position, just medial to the tail of the caudate. The fornix is attached to the under surface of the corpus callosum. Both are runnung rostrally, but as they approach the anterior pole of the thalamus, they will descend (move ventrally), passing quite close to the anterior commissure. NEXT