What is that thing at the head of thr chair for and why in the world would they need straps on the stirrups wtf?

It's things like this that make me not want to believe people when they tell me "no they don't strap you down" when I get on my annual preholiday health kick and think about going to the dr

What is that thing at the head of thr chair for and why in the world would they need straps on the stirrups wtf?
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