What is a Fixator

Question

What is a fixator?
A) A muscle that holds an origin stable for another muscle
B) A Muscle that has the same action
C) The main muscle of the synergist to perform the action
D) A muscle that has the opposite action

Accepted Answer

A fixator is a muscle that holds an origin stable for another muscle. Synergists are muscles that have the same action. A prime mover is the main muscle of the synergists to perform the action. An antagonist is a muscle that has an opposite action.