Your flexor tendons are located on the palm side of the wrist, fingers, and thumb. The tendons attach to muscles in the forearm and control your ability to flex your wrist, fingers, or thumb. There are nine flexor tendons that pass over the wrist into the hand. Depending on the size and location of the injury, a laceration can occur to an isolated tendon or to multiple tendons.
If nearby nerves were also cut, the area may become numb.
A deep cut by a knife or broken glass, or a sudden jerk from a contact sport like football can cause your flexor tendons to be cut partially or completely.