Usually, it originates from a recurring motion or forceful use of one's finger or thumb. Tendons are fibrous cords that attach muscle to bone. Each and every tendon is surrounded by a protecting sheath.  Dealing with symptoms in your hand or wrist that influence your everyday life? Our MOH-accredited specialist https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/