Pivot Joints in the Body: Types & Examples

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  • 0:00 What are Joints?
  • 0:59 General Types of Joints
  • 2:04 What is a Pivot Joint?
  • 3:03 Lesson Summary
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Lesson Transcript
Instructor: Betsy Chesnutt

Betsy teaches college physics, biology, and engineering and has a Ph.D. in Biomedical Engineering

Did you know that whenever you turn your head, you are using a pivot joint? In this lesson, you will learn about the types of joints in your body and specifically about how pivot joints function and where they are located.

What are Joints?

Did you turn your head today? Or perhaps you used your wrist to twist the lid off of a bottle? Both of these actions, and many more, would be impossible without pivot joints. Pivot joints allow rotation, and although you have many joints in your body, there are only three pivot joints. They are located in your neck, your wrist, and your elbow. To really understand how pivot joints work, let's first take a minute to learn about how all joints function.

Joints are junctions between bones that allow your bones to grow and enable your body to move when your muscles contract. Without joints, you wouldn't be able to move at all! There are many joints in your body, and some allow more types of movement than others. Some of the largest joints, such as the knee, hip, shoulder, and wrist, actually contain several smaller joints that work together to permit you to have a wide range of motion.

General Types of Joints

In your body, there are three general types of joints. They're classified according to how much motion they allow.

Fibrous joints are between bones that are in close contact and do not move much at all. This is the type of joint between the bones in your skull.

Cartilaginous joints connect two bones with cartilage in between them. Cartilage is a little bit flexible, so these joints allow a small amount of motion, but not very much. The joints that connect your ribs to your sternum (in the center of your chest) are cartilaginous. This allows the chest to expand and contract a little bit as you breathe.

Finally, the major joints in your body, like the knee, hip, wrist and neck, are synovial joints. A synovial joint includes two or more bones that are covered with slippery cartilage at each end and is enclosed by a capsule that secretes a very slippery fluid that lubricates the joint called synovial fluid. Pivot joints are one type of synovial joint.

What is a Pivot Joint?

radioulnar joint

Pivot joints are joints that allow bones to rotate. In a pivot joint, a cylinder shaped bone rotates inside another bone or ligament that forms a ring around it. To see how a pivot joint functions, just turn your head from side to side! In your neck, there's a pivot joint between your skull and the top vertebrae that allows your head to turn.

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