The two major groups are flexors and extensors.
The extrensic muscles of the hand originate from the lateral epicondyle of the humerous
Extrinsic muscles of the hand originate in the antebrachium (forearm).
There are no muscles in the human finger. The muscles that bend the finger are located in the palm and in the mid forearm, and are connected to the finger bones by tendons, which pull on and move the fingers.
The median nerve supplies most of the flexor muscles of the human forearm, and some hand muscles. The ulnar nerve also supplies two flexor muscles, and most of the remaining hand muscles that the median nerve does not cover.
Biceps and forearm muscles are used
You have three nerves, which supply your forearm. Radial, ulnar and median nerve. Out of these three nerves, median nerve is the main nerve to supply forearm muscles and some of the hand muscles.
One of the most important functions of the radius is anchoring the muscles of the upper arm and the forearm. It is found on the thumb side of the forearm and rotates to allow the hand to pivot at the wrist.
One of the most important functions of the radius is anchoring the muscles of the upper arm and the forearm. It is found on the thumb side of the forearm and rotates to allow the hand to pivot at the wrist.
biceps
The muscles used in gripping strength are those in the forearm and hands. In athletics, gripping strength exercises is measured with a hand grip dynamometer.
Function: flexion and radial deviation of the wrist, along with other muscles which flex the wrist and radially deviate the wrist, weak pronation of the forearm along with other muscles which pronate the forearm and weak flexion of the elbow along with other muscles which flex the elbow
Mostly your forearm muscles but also your bicep. A good way to work out your forearm is to sit on a bench with a weight in your hand and curl your wrist up and then let it down. Do that twenty times and do four sets of them with each arm.