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O movement of bone at a synovial joint is best

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oMovement of bone at a synovial joint is best described with respect to three intersecting perpendicular planes or axes:Joint is uniaxialof the bone moves in just one plane or axis.Joint is biaxialif the bone moves in two planes or axes Joint is multiaxial (triaxial) if the bone moves in multiple panes or axes oAll synovial joints are diarthroses, as mentioned, but some are more mobile than others. From least mobile to most freely mobile, the six specific types of synovial joints are plane joints, hinge joints, pivot joints, condylar joints, saddle joints, and ball-and-socket joints. Plane joint, also called a planar or gliding joint, is the simplest synovial articulation and the least mobile type of diarthrosis. Described as a uniaxial joint because it usually allows only limited side-to-side movements in a single plane, and because there is no rotational or angular movement with this joint. The articular surfaces of the bones are flat, or planar oExamples include: the intercarpal and intratarsal joints. Hinge jointis formed by the convex surface of one articulating bone fitting into a concave depression on the other bone in the joint.
Movement is confined to a single axis, like the movement seen at the hinge of a door, so a hinge joint is considered a uniaxial joint. oExample is the elbow joint. Forearm can be moved only anteriorly toward the arm or posteriorly away from the arm. oOther example: knee and finger joints Pivot jointis a uniaxial joint in which one articulating bone with a rounded surface fits into a ring formed by a ligament and another bone. First bone rotates om it longitudinal axis relative to the second bone oExample: the proximal radio-ulnar joint, where the rounded head of the radius pivots along the ulna and permits the radius to rotate. oExample: the atlanto-axial joint between the first two vertebrae. The rounded dens of the axis fits snugly against an articular facet on the anterior arch of the atlas. This joint pivots when you shake your head “no.”Condylar joints, also called condyloid or ellipsoid joints, are biaxial joints with an oval, convex surface on one bone that articulates with a concave articular surface on the second bone of the joint. Biaxial joints can move in two axes, such as back-and-forth and side-to-side oExamples: the metacarpophalangeal (MP) joints of fingers 2 through 5. These joints are commonly referred to as knuckles. oYou can flex and extend the fingers at this joint which is one axis of movement. And you can move your fingers apart from each other or closer together this is the second axis of movement. Saddle joint is so named because the articular surfaces of the bones have convex and concave regions that resemble the shape of a saddle.

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Term
Fall
Professor
Walker
Tags
joints, hinge joint, joint capsule, articular capsule

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