What are the primary and secondary centers of ossification?

There are two types of ossification centersprimary and secondary. A primary ossification center is the first area of a bone to start ossifying. It usually appears during prenatal development in the central part of each developing bone. In long bones, the secondary centres appear in the epiphyses.
A.

What is ossification and when does it begin?

Bone formation, also called ossification, process by which new bone is produced. Ossification begins about the third month of fetal life in humans and is completed by late adolescence. The cartilage cells die out and are replaced by osteoblasts clustered in ossification centres.
  • What attaches bone to bone?

    Tendons may also attach muscles to structures such as the eyeball. A tendon serves to move the bone or structure. A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
  • What is it called when a bone is forced out of its joint?

    Type of muscle that is voluntary and striated. Occurs when a bone is forced out of its joint. Only type of tissue that is able to contract. Flexible connective tissue that makes up our nose and ears.
  • What is it called when cartilage turns to bone?

    This process occurs primarily in the bones of the skull. In other cases, the mesenchymal cells differentiate into cartilage, and this cartilage is later replaced by bone. The process by which a cartilage intermediate is formed and replaced by bone cells is called endochondral ossification.
B.

Where does ossification occur in the bone?

As the primary center of ossification, the diaphysis of the long bone is the first to form spongy bone tissue along the cartilage, followed by the epiphyses, which form the secondary centers of ossification and are separated from the diaphysis by a layer of uncalcified cartilage called the epiphyseal plate, where all
  • How is the fracture of the bone healed?

    Chondroblasts: cell that make cartilage and help in bone healing after a break. Hard callus: a hard bump that forms around a fracture when a bone is broken and healing. Osteoclast: cells in your body that break down bone material in order to reshape it.
  • What bones protect the lungs and heart?

    The heart and the lungs are protected by the ribcage. The sternum in front, ribs in two side and 12 thoracic vertebrae in the back form the bony cage for protection of these vital organs.
  • Where does ossification occur in the bone?

    As the primary center of ossification, the diaphysis of the long bone is the first to form spongy bone tissue along the cartilage, followed by the epiphyses, which form the secondary centers of ossification and are separated from the diaphysis by a layer of uncalcified cartilage called the epiphyseal plate, where all

Updated: 29th September 2018

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