Extensor motor response is a reflex movement of straightening the arms and legs.
From the sciencedaily.com
So do strong extensor muscles, which run up and down the full length of the back.
From the dailyherald.com
Most arachnids lack extensor muscles in the distal joints of their appendages.
From the en.wikipedia.org
Male sprinters have 21 percent greater ankle extensor strength than female sprinters.
From the sciencedaily.com
It is the common extensor origin that originates at the lateral epicondyle.
From the en.wikipedia.org
In your case, I suspect that the extensor tendons have become inflamed.
From the telegraph.co.uk
Also, the index finger and the little finger have an extra extensor, used for instance for pointing.
From the en.wikipedia.org
Most of the studies have looked at one specific area such as knee extensor strength and jump height.
From the smh.com.au
Repeated damage to the extensor capsules of the knuckles can lead to long term problems with dexterity.
From the en.wikipedia.org
More examples
Extensor muscle: a skeletal muscle whose contraction extends or stretches a body part
Extension is a movement of a joint that results in increased angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved. For example, extension is produced by extending the flexed (bent) elbow. ...
(Extensors) These are composed of back and gluteal muscles. These muscles help keep your back straight, assist in efforts involving lifting, and moving your thigh away from the body.
Adjective from the noun "extension". The muscles which cause extension of a part are its extensor muscles; the surface of a part where those muscles are found is sometimes called the extensor surface.
A muscle serving to extend a bodily part.
Involving extensor surfaces of limbs. Contrast with flexor surfaces.
A muscle that bends a part of the body outwards.
The outer surfaces of joints, such as the fronts of the knees and the outside of the elbows.
A muscle, the contraction of which causes movement at a joint with the consequence that the limb or body assumes a more straight line, or so that the distance between the parts proximal and distal to the joint is increased or extended; the antagonist of a flexor.