Joints Flashcards
what is a joint
A joint is a site at which 2 or more bones come together.
If bones fit together tightly the joint is strong but little or no movement.
Loosely fitted joints allow a greater range of movement but are weaker nd prone to dilocation
how do you classify joints
Joints are often classified according to their range of movement (functional).
They may be classified by the type of connective tissue that binds bones together (structural)
what is a fixed joint
There is no movement between the bones and they are held in place by fibrous tissue. It is very strong that the bone will fracture before the joint gives way
what is an example of a fixed joint
structures of the skull, teeth and jaw
what is a slightly moveable joint
These joints are held in place by cartilage which allows slight movement to occur.
what is an example of a slightly moveable joint
- junction of two pelvic bones
- between two vertebrae
- between ribs and sternum
what are slightly moveable joints also referred to as
cartilaginous joints
what are freely movable joints?
Most joints of the body are freely movable. Movement may be limited by ligaments, tendons, muscles and adjacent bones. Are categorised by type of movement.
what are freely movable joints also referred to as
synovial joints
what are the different types of synovial joints
- ball and socket
- hinge
- pivot
- saddle
- condyloid
therefore what are the different types of joints
- fixed joints or immovable joints
- slightly movable joints
- freely movable joints or synovial joints
what is a ball and socket joint
Form when the spherical head of one bone fits into a cup-like cavity of another.
what is a hinge joint
Allows movement in one plane only. They form when the convex surface of one bone fits into the concave surface of another
what is a pivot joint?
Formed when the rounded, pointed or conical end of one bone articulates with a ring, formed partly by bone and ligament
what is a gliding joint
Allows movement in any direction in a side to side or back and forth motion, restricted only by ligaments.
