Sorry, I struck out looking at all three. Maybe someone else can be of help.
This is the lumbar region, or at least it looks like the lumbar to me. In the lumbar region, the cord splits into something called the cauda equina - a bunch of nerves radiating out from the lowest part of the thoracic, that ennervates the lumbar area. The last place to have a spinal lesion in the back is the base of the cord, called the conus medullaris. That's located between the thoracic and the lumbar, about L1 or L2.
I don't see anything abnormal in this film either, but as I mentioned, it's important to leave this sort of thing up to the radiologists, as they're trained to look for certain kinds of activity. What I'm seeing as normal might be abnormal, and vice versa.
If you're looking for more information on MRIs and how it works, feel free to check out our health pages at the upper right corner of the screen. There's lots of good information that will help answer your questions.
Welcome to the forum! Let us know how things go - Jen