What is the difference between symphysis and synchondrosis

In addition, the thick intervertebral disc provides cushioning between the vertebrae, which is important when carrying heavy objects or during high-impact activities such as running or jumping. A synchondrosis is formed when the adjacent bones are united by hyaline cartilage. A temporary synchondrosis is formed by the epiphyseal plate of a growing long bone, which is lost when the epiphyseal plate ossifies as the bone reaches maturity.

The synchondrosis is thus replaced by a synostosis. Permanent synchondroses that do not ossify are found at the first sternocostal joint and between the anterior ends of the bony ribs and the junction with their costal cartilage. A symphysis is where the bones are joined by fibrocartilage and the gap between the bones may be narrow or wide. A narrow symphysis is found at the manubriosternal joint and at the pubic symphysis.

A wide symphysis is the intervertebral symphysis in which the bodies of adjacent vertebrae are united by an intervertebral disc. Although they are still growing, the carpal bones of the wrist area do not show an epiphyseal plate. Instead of elongating, these bones grow in diameter by adding new bone to their surfaces.

Cartilaginous joints are where the adjacent bones are joined by cartilage. At a synchondrosis, the bones are united by hyaline cartilage. The epiphyseal plate of growing long bones and the first sternocostal joint that unites the first rib to the sternum are examples of synchondroses.

At a symphysis, the bones are joined by fibrocartilage, which is strong and flexible. Symphysis joints include the intervertebral symphysis between adjacent vertebrae and the pubic symphysis that joins the pubic portions of the right and left hip bones. Both functional and structural classifications can be used to describe an individual joint. Define the first sternocostal joint and the pubic symphysis using both functional and structural characteristics. The first sternocostal joint is a synchondrosis type of cartilaginous joint in which hyaline cartilage unites the first rib to the manubrium of the sternum.

This forms an immobile synarthrosis type of joint. The pubic symphysis is a slightly mobile amphiarthrosis cartilaginous joint, where the pubic portions of the right and left hip bones are united by fibrocartilage, thus forming a symphysis. Skip to content Joints. Learning Objectives By the end of this section, you will be able to: Describe the structural features of cartilaginous joints Distinguish between a synchondrosis and symphysis Give an example of each type of cartilaginous joint.

Cartiliginous Joints. These cartilaginous joints are composed entirely of hyaline cartilage and are known as synchondroses. Most exist between ossification centers of developing bones and are absent in the mature skeleton, but a few persist in adults. These are permanent joints called symphyses and are composed of fibrocartilage.

They are considered amphiarthroses , meaning that they allow only slight movement and are all found at the skeletal midline. Please Note: You can also scroll through stacks with your mouse wheel or the keyboard arrow keys. Updating… Please wait. Unable to process the form.

Check for errors and try again. Thank you for updating your details. Log In. Sign Up. Become a Gold Supporter and see no ads. Log in Sign up. These are examples of temporary synchondrosis. The permanent synchondrosis is situated in the thoracic cage. The main point at which the joint is formed is the first sternocostal joint, between the first rib and the manubrium of the costal cartilage.

There is less movement between the synchondrosis joints. Therefore, permanent joints are more stable due to this factor. Symphysis is the second type of cartilaginous joint where the fibrocartilage joins two bones.

It is stronger in nature in comparison to the synchondrosis. The strength of the symphysis is more stable because it contains many bundles of very thick collagen fibres.

Thus, this gives the structure more resistance and it resists the pulling and the bending forces. Due to the high rigidity, the movement between the bones is hindered. The distribution of the symphysis is seen in the pubic portions of the right and left hip bones. It is also present in the site which unites the manubrium to the sternum.

The symphysis joints are also distributed in between vertebrae of the vertebral column. The characteristic feature of the symphysis joints located at the vertebral column provides strength to withstand the shock created on the vertebral column. Synchondrosis and symphysis are two types of joints which are cartilaginous in nature. Since both joints are cartilaginous, the principle factor of differentiation is the type of cartilage.