Answer:
nape, scruff
Explanation:
I Googled it, I'm too dumb to know the answer off the top of my head
Tremors from Parkinson's disease are most prominent when your hands are at your sides or resting in your lap. Associated conditions. Essential tremor doesn't cause other health problems, but Parkinson's disease is associated with stooped posture, slow movement and shuffling gait.
source: https://www.mayoclinic.org/diseases-conditions/essential-tremor/symptoms-causes/syc-20350534
A person or multiple people are involved, they have rules, and normally directions