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Extension
hyperextension
extension
Well the limb will be Extended and the muscle will be elongated or in "extention", as opposed to a flexed or shortented muscle.
parkinsons disease
A false limb is called a prosthetic.
Flex is a synonym for flexed.
It is called regeneration
On his or her back with their knees flexed
Straightening.
Limb?
It is a branch