Clearly it wasn't the entire brain cause that'd require ripping out the spinal cord. So perhaps parts of the brainstem were still left behind and it's possible for a creature to continue existing with only just that part of their brain left. En.wikipedia.org
there is question related to a Urine Sample on the paper above.
I think the Doctor had that Attorney's brain on his desk most likely...
I mean, the dude could still a vegetable or something.
Clearly it wasn't the entire brain cause that'd require ripping out the spinal cord. So perhaps parts of the brainstem were still left behind and it's possible for a creature to continue existing with only just that part of their brain left.
En.wikipedia.org