If you go to Google Search and type in "Parts of the Brain," it will bring up all kinds of sites to give you a full look at the brain and all it's structure.
I feel for you, with the "winker camera." You guys have such a small opening to the urethra that "pencil" size is scary. Don't worry too much, they use LOTS of K-Y jelly, just as they do with us women. They may even put on a numbing cream before hand. It should be no more uncomfortable that a catheter they use to drain the bladder. Trust me.
Hope you get through all of this. I know it's a touchy subject, but Harry, we DO care and are concerned for your comfort. We really do fella.
Big Hugs,
Heather
YIKES - but LOL!! Sorry, it was the winker part that made me spit the water out of my mouth!!! I pray you are in good hands, and that you find out what's going on.
Someone else on the board has something going on in the PONS, I just can't remember who. I'll do a search and see what I can find.
hang in there,
SL