Question

What are the cartilaginous bones? Explain.

Answer 1

Hint: It is a type of joint where the bones are attached by cartilage or hyaline cartilage. These joints allow more movement then the fibrous joint but less movement than the synovial joints. The joint between the adjacent vertebrae in the vertebral column is of this pattern and it permits limited movement.

Complete answer:
Cartilages are made up of collagen, a protein substance. Cartilages are present throughout our body. They might be bones, joints or a support tissue. A bone before becoming a bone, it is made up of cartilages. This cartilage contains chondrocytes which helps to build up to form cartilage which become bone by osteocytes cells. In Cartilaginous joints, the bones involved are joined together with the help of cartilages. They are also called as replacing bones, examples: humerus, femur, etc.
It is of two types:
1. Primary cartilaginous joint:
It is composed of hyaline cartilage and known as synchondroses and absent in mature skeleton
Example: growth plates, synchondroses related to apophyses, etc.

2. Secondary cartilaginous joint:
They are the permanent joints called symphyses and composed of fibrocartilage.
They only allowed slight movement and are all found at the skeletal midline
Example: symphysis pubis between the right and left pubic bones, intervertebral discs.

Note:
Cartilage lacks blood supply, nerves and lymphatic system. Chondrocytes are the only cells normally found in cartilage. Chondrocytes produce and maintain the Cartilage matrix. Loss of the cartilage in one or more joints can be very painful and eventually lead to functional limitations or possibly even cause disability. Preserve cartilage by keeping your joints healthy.