What is an interphalangal joint?
Interphalangal joint is one of the joints between phalanxal bones that are bones in the fingers and legs. This articulation is a type of synovial or movable joint capable of bending and extending and bending and straightening - digits. There are two in each of the four fingers and fingers and in the thumb and at the tip. The interphalangal joint closest to the hand and leg is known as proximal or close to the joint, and the closest toes of the fingers and fingers are known as distal or far, the joint. friction and synovial membrane to protect the content of the joint. Outside the joint capsules, the ligaments connecting the neighboring phalanx bones are together. On both sides of the joint are bonds known as collateral ligaments that run parallel to the number, provide side stability of the joint and hold the bones in place.
on the palmor surface of the joint in the hand and the plantar surface in the leg is what is referred to as the Volar ligament, which is a thin flat ligaErexlens of the finger or toes. Similarly, on this side there is a tendon of a muscle in hand or a leg that bends a finger or tip. Excuration of the back or rear surface of the digit is an extensive tendon that is a tendon of a muscle in hand or a leg that straightens the digit.
In the hand, the proximal interphalangal joint is identifiable almost in the middle of each of the four fingers, where a large joint is found, while the distal joint is smaller by an inch or under the fingers. The proximal joint shows a greater range of flexion and extension than the distal joint, with about 100 degrees of movement in the proximal joint and 80 degrees of movement in the distal joint. The flexion of both joints in the fingers is initiated by two front forearm muscles, Flexor Digitorum Profundus and Flexor Digitorum Superficialis. In the thumb of Flexor Pollicis Longus, the only interphalangal joint bends. The extension of these joints is initiated by the muscle of the extensor digitorum in the back forearm and in the case of the Extensor Pollicis Longus thumb.
because interphalangal joints in nRES are analogous to those in the hand, in each of the smaller fingers there is also a proximal and distal interphalangal joint and the only interphalangal joint in the large tip. They are placed much closer to each other than those in their hand and show a smaller range of movement, while the proximal joint is similarly capable of greater flexion and extension than the distal joint. The flexion of these joints in the four fingers are activated by Flexor Digitorum Longus in the back lower leg, with the flexor hallucis longus the large finger. Extensor Digitorum Longus in the front lower leg is activated in the front lower leg, while the extensor hallucis longus straightens a large finger.