This joint allows a person to bend the tip of their thumb. The interphalangeal joint (IP) is present at the tip of the thumb, just before the fingernail starts, and is similar to the distal interphalangeal joint of the other four fingers. The thumb then connects to the hand bone, or thumb metacarpal.Īs a result of only having two phalanges, the thumb only has one joint, while the other fingers have two joints. The second bone - proximal phalange - then extends from the knuckle to the base of the thumb. The first bone - the distal phalange - extends from the tip of the thumb to the knuckle. As with the rest of the hand, the thumb consists of many different structures that allow for movement and dexterity.Įach finger has three bones, or phalanges, except for the thumb, which instead has two phalanges.
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