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1. Joints
A joint is the place where two or more bones connect. Joints are made of connective tissue and cartillage and can be classified as: * fibrous joints (such as those in the skull) connect bones with fibrous connective tissue; they allow little or no movement. * cartilaginous joints (vertebrae, for example) connect bones with cartilage and fibrous connective tissue; they also allow little or no movement. * synovial joints contain synovial fluid, which lubricate the joint and absorbs frictional heat created by the joint's movement. There are several sub-types of synovial joints: * ball and socket joint: the rounded head of one bone fits into a socket-like cavity of another, such as the hip and shoulder joints. These joints allow free rotation * hinge joint: elbow and ankles. These joints allow for flexion and extension. * saddle joint: the thumb. Bone surfaces are concave, allowing movement in all direction but only limited rotation. * ellipsoid joint: structurally similar to a ball and socket joint but without rotation. * pivot joint: the skull on its spinal axis; movement is limited to rotation. * gliding joint: the wrist. Bone surfaces slide across each other, allowing a wide range of movements.

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