It could be cervical radiculopathy or impingement.
I think what your after is called an antagonistic pair of muscles, for example the bicep and the tricep. When the bicep is contracting the tricep relaxes and when the tricep is contracting the bicep relaxes.
The tricep is the muscle on the underside of the upper arm. The muscle on the upper side is the bicep.
The bicep muscle. The tricep contracts to straighten the arm as the bicep relaxes.
tricep and bicep
your tricep and bicep will be apart of your upper muscle
There are two main ones, the tricep and the biscep. The tricep bicep is on the inside angle as defined by your elbow, the tricep is on the outside.
Your arm uses its bicep and tricep muscle to move. Muscles can only contract so they have to work in pairs. Ex. Bicep and tricep One muscle contract, the other relaxes
The Bicep muscle (one on top) is contracting The Tricep muscle (one below) if relaxing The Bicep and Tricep muscles are antagonistic- they work as opposites, so when one contracts, the other relaxes.
Examples are the Quadricep and the Hamstring, or the Bicep and the Tricep. Without the pair muscle, once an action was carried out, there would be no way to undo it.
The tricep contracts and the bicep relaxes.
There are two major ones. The bicep brachii (more commonly know as just the bicep, or slang is guns (In the UK any way)) is on the front and the Tricep brachii (usally just called the tricep) is on the back.
The bicep is the front part of your arm. The tricep is the muscle in the back part of the arm.