What is the proximal interphalangal joint?
The proximal interphalangal joint is one of the two articulations in the four fingers of the hand and four smaller fingers of the legs. It is located between the first and the second Falangs, the finger and the bone of the fingers, it is the second joint from the fingers and fingers. Unlike the distal interphalangal joint, the first joint from the fingers and fingers, the proximal joint is slightly larger and shows a greater range of movement. Since the thumb has only two phalanx more than three, there is no difference between the proximal and distal intermediate joints. Therefore, only four fingers show this joint. Flexors proximal interphalangal joint includes flexor digitorumprofundus and flexor digitorum superficialis. These are deep muscles found in the front or palm side of the forearm. Both are considered to be the external flexors of the hand because the muscles are placed in the forearm; Only their tendons penetrate hand. Contractions of these muscles allow up to 100 degrees of flexion in the proximal joint, while in the distal joint is afterChoose only about 80 degrees of flexion.
The prolongation of the proximal interphalangal joint is provided by the external muscle of the hand, the extensor digitorum. It is centrally located in the back of the forearm and the tendons flow through the back of the hand into the middle and distal phalanx. The enabled extension is relatively limited by the presence of very strong bonds, palmar and collateral bonds that prevent the joint from hyperextendi. Due to the rigidity of these structures, the proximal interphalangal joint is the most commonly broken joint in the body.
Similar joints are found among the phalanx of four smaller toes, because the large finger like thumb has only one interphalangal joint. The proximal interphalangal articulation of the foot is also bent and prolonged, with an extension of the limited presence of plantar and collateral bindings. The bends of this joint in the leg include Flexor Digitorum Longus and Flexor Digitorum brevis found at the back of the bottomHis legs and foot footstool. The extensors of this joint include Extensor Digitorum Longus and Extensor Digitorum brevis, found in the front compartment of the lower leg and the back surface of the foot.