neuroanatomy - oodles. refer to HY. you need to know left from right, up from down, and one structure from the next.
x-sectional anatomy - scattered in there. you have to be able to ID stuff. some of the structures are "low yield." I saw stuff that I hadn't looked at since first year. most of anatomy is neuroanatomy.
most of the path questions that have associated images can be answered from the stem. We're talking a handful of questions where you actually need to stop reading and look at the histology or gross presentation. If you KNOW what's in the image, sometimes it's a dead give-away, thus, rendering the stem superfluous. Very few "What is THIS?" questions though.
em - a handful. these can be tough. some of the images were so-so quality, but it's not worth reading Ross Histology cover to cover the week before the exam. Low yield. HY Histo is a great read (for other reasons) and has relevent images.
then again, every exam is different. even more striking is that every block is different. One could have seven images and the next one or zero. Average was about four.