1.7. Skeletal System Joints http://www.ck12.org
- Agliding jointis a joint which allows only gliding movement. The gliding joint allows one bone to slide over
the other. The gliding joint in your wrist allows you to flex your wrist. It also allows you to make very small
side-to-side motions. There are also gliding joints in your ankles.
Vocabulary
- ball-and-socket joint: Joint where the ball-shaped surface of one bone fits into the cup-like shape of another;
examples include the hip and shoulder. - fixed joints: Joint that does not allow movement.
- gliding joint: Joint that allows only gliding movement.
- hinge joint: Joint that only allows motion in two directions, forward and backward; examples include the
knees and elbows. - joint: Point at which two bones meet.
- movable joints: Joint that allows the most movement.
- partly movable joints: Joint that allows only very limited movement.
- pivot joint: Joint permitting only rotating movement.
Summary
- Joints, a point at which two or more bones meet; they can be fixed, partly movable, or movable.
- Types of movable joints include the ball-and-socket joint, hinge joint, pivot joint, and gliding joint.
Practice
Use the resource below to answer the questions that follow.
- Joints of the Skeletonat http://www.youtube.com/watch?v=VsBJ4oUff10 (0:45)
MEDIA
Click image to the left for more content.- Why do we have both fixed and moveable joints? What is an example of a fixed joint? How would an organism
be affected if this joint was moveable? - What are the best joints for movement?
- What is synovial fluid? Where is it located? What is its function?
- What is the function of the knee cap?
Review
- What’s the difference between a fixed joint and a movable joint?
- Describe the four types of movable joints.