An example of a cartilaginous joint is the manubriosternal joint.
Cartilaginous Joints Explained
Cartilaginous joints are connections between bones held together by cartilage. Unlike synovial joints that have a joint cavity, cartilaginous joints have no cavity and allow limited movement. They can be classified into two main types: primary and secondary.
Primary Cartilaginous Joints (Synchondroses)
- These are temporary joints where the bone is connected by hyaline cartilage.
- They usually exist during growth and become ossified (bone) as development progresses.
- An example would be the epiphyseal plate, the growth plate, in children's long bones.
Secondary Cartilaginous Joints (Symphyses)
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These joints are permanent and have fibrocartilage, offering more flexibility than primary joints.
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They are designed for strength and flexibility.
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Several important joints in the body are classified this way, including:
- Manubriosternal Joint: The joint between the manubrium (the upper part of the sternum) and the body of the sternum.
- Intervertebral Discs: These are located between the vertebrae of the spine and provide shock absorption and flexibility.
- Pubic Symphysis: This joint is located between the left and right pubic bones in the pelvis.
Table of Examples
| Joint Type | Location | Cartilage Type | Movement |
|---|---|---|---|
| Primary (Synchondroses) | Epiphyseal plate in long bones, 1st sternocostal joint | Hyaline Cartilage | Immovable, temporarily |
| Secondary (Symphyses) | Manubriosternal Joint, Intervertebral discs, Pubic Symphysis | Fibrocartilage | Limited Movement |
Why is the Manubriosternal Joint Important?
The manubriosternal joint is a secondary cartilaginous joint, which provides some flexibility between the manubrium and body of the sternum. This flexibility aids in chest expansion during breathing and physical activities. It is a vital component of the rib cage and helps in its overall function.
