Question:
The major bullet frags deflected upwards breaking apart the skull roughly from the posterior parietal bone to the coronal suture (mostly on the right); that opening offered the path of least resistance to the exploding brain tissue (and the tiny metal frags that went along with it), so that's exactly where it all went.

I still can't picture how this best explains the orientation of the laceration. I marked on the MRI the laceration as the autopsy describes it as best as I could. I avoided the 4.5 cm figure and located the based of the laceration "in the white matter." (I think I have that right in the diagram.) I also plotted possible paths for the major fragments as you describe above. Does that accurately represent your viewpoint?

Answer: The mid-brain damage was probably caused by the concussion or explosive force of a nearby passing bullet fragment, such as the one traveling from the tip of the occipital lobe to the tip of the frontal lobe. To suggest that the BONE fragments seen by McDonnell in the sphenoid sinus traversed all the way from the cowlick entry site, along the way passing through the bony structure over the sphenoid sinus called the, "floor of the sella turcia, and caused that mid-brain damage is.....well, he actually smiled and shook his head. Those bone fragments were obviousy associated with the fracture in the floor of the sella turcia (just above where the bone frags were seen) that was also reported by McDonnell.

It's hard to be positive, but a bullet entering at the low site would almost certainly have torn the tentorium but may have only severly bruised, or slightly lacerated the cerebellum, that damage being consistent with what was reported and with Dox's drawings of the brain. And I know what the other side is thinking; Boswell testified that the tentorium was intact....BUT, he also signed off on WC CE-385 wich shows a bullet passing right through the center of the cerebellum! Be cautious of witness testimony, especially that which is 34 years old, is the point.