What is inside a column shift steering column?

Hello, I have a couple of questions re A body steering columns that I hope you can help with. My car is a 68 Plymouth Valiant. It has a column shift auto. Can anyone tell me what, if anything runs through the housing surrounding the top of the column in the engine bay as per the attached picture? I have been told floor shifts have nothing so I am wondering if it is the same with a column shift. Secondly would the steering column be a solid piece or are they hollow? Appreciate any advice you may have. Thanks.

notched 2.jpg