[Tham]

This employee in my office, aged about 60, had a traumatic brain injury
from a construction site accident some years ago.

In that accident, a truck door apparently hit the rear of his skull with force.

He was unconscious for several minutes and hospitalized for a day or two thereafter.

Since then, he suffers from what looks very much like Parkinson's disease-type
symptoms - mainly movement disorders with shaking of his hands when holding
items, shaking of his legs, and difficulty walking straight, managing only slow,
staggered steps.

Initially, I thought that perhaps the accident had damaged his substantia nigra, or
the region of the brain around there, thus accounting for the Parkinson's symptoms.

However, he can walk up and down staircases in quite a normal manner, very quickly
and with ease indeed, which is obviously not the case with Parkinson's patients.

While he is under treatment with a neurologist, I was wondering which part of his
brain may have been damaged.