The wrinkles on the back of the finger knuckles are actually dimples , and mark areas where the skin is attached to the tendon beneath the skin. Finger joints only have wrinkles and creases if the joint moves. If a finger joint stops moving, the creases eventually flatten out. Birth One out of six of congenital anomalies recorded on birth statistics involve the upper extremities. White children are four times more likely than black children to be born with webbed fingers.
Black children are ten times more likely than white children to be born with extra fingers.
29 major joints. At least 123 named ligaments. 24 named sensory branches. 21 named muscular branches. 30 named arteries and nearly as many smaller named branches.