What are the carpometacarpal joints?
The joints of carpometakarpal (CMC) are located between the bones of the hand and the wrists. Specifically, it is the articulation between the grouped carpal bones at the base of the hand and the metacarpals, five long bones stretch over the hand to the base of each finger. The joints of the carpometakarpal under four fingers are known as arthrodial or sliding joints, synovial or movable joint type that allows the bones to slide against each other. The joint at the thumb base is another type of synovial joint called a gable joint and allows a much greater range of movement than the other four joints. The proximal range is articulated with one of the long forearm bones, about radius to create a radiocarpal or wrist. Behind the proximal series, the distal series of cards will encounter the proximal or close to the end of the five metacarpals to form five carpometacarpal joints. There are four cards in the distal row, with a hamate on the side of the finger pinky, the captain beside her, then a trapezoid and finally a trapezoid on the pallet.
Metakarpal fifth or pinky-for-fits with hamina. The fourth or ring finger articulates with a hamina and a nearby corner of the capital. The third or medium finger metacarpal is mostly encountered with a capital. Second or index-prize metacarpal references to trapezoidal, although it touches the capital and trapezoid on both sides and the first or inch metacarpal forms the joint with the folk bone.
as second to fifth carpometakarpal joints do not allow a wide range of motion on the joints themselves. Instead, the wrists make the joint more flexible in that they allow metacarpal and carpal bones to move around the end of the bone of the radius. In addition, these four carpometacarpal joints allow movement around the palm arch. This is a concave curve on the base of the palm, when the hand of the curly around the object like a baseball and created by the internal rotation of the fifth metacarpal. Allows you to grasp smallthe subjects.
The first CMC joint is located on the base of the thumb. It differs from the last four joints of carpometakarpal in that it allows a wide range of movement that distinguishes the human thumb as a con contracted or able to grasp and hold things. As a seller or saddle, a joint that gets its name, because the ends of two adjacent bones resemble a pair of saddles arranged perpendicular and curved around, the first joint CMC allows the front and side of the side. It also allows circuits, circling movement and opposition, which is the drawing inside the thumb to touch the tip with its tip.