1.1.7 - 1.1.10 - Types of joints

A joint occurs where two bones articulate (where they meet)

Gliding, hinge, pivot, condyloid, saddle, ball-and-socket

• move against each other on a single plane • major gliding joints examples are intervertebral joints and bones of wrists and ankles

• move on just one axis • allow for flexion and extension • major hinge joints examples are elbow and finger joints

• provides rotation • at the top of the spine, the atlas and axis form a pivot that allows for the rotation of the head

• allows circular motion, flexion, and extension • wrist joint between the radius and the carpal bones is an example of a condyloid joint

• allows for flexion, extension, and other movements, but no rotation • thumb saddle joint lets thumb cross over the palm, making it opposable

• freely moving joint that can rotate on any axis • hip and shoulder joints are examples of ball and socket joints

THE STRUCTURE OF A SYNOVIAL JOINT

Shock absorber

Makes synovial fluid

Lubricates and reduces friction

Reduce friction, facilitate movement

Shock absorber, increase stability

Stability

Support