What is endochondral ossification in detail?
Endochondral ossification involves the replacement of hyaline cartilage with bony tissue. Most of the bones of the skeleton are formed in this manner. These bones are called endochondral bones. In this process, the future bones are first formed as hyaline cartilage models.
What are the 6 major steps in endochondral ossification?
Terms in this set (6)
- Cartilage enlarges; Chondrocytes die.
- blood vessels grow into perichondrium; cells convert to osteoblasts; shaft becomes covered with superficial bone.
- more blood supply and osteoblasts; produces spongy bone; formation spreads on shaft.
- Osteoclasts create medullary cavity; appositional growth.
Where does endochondral ossification occur?
Endochondral ossification occurs at two distinct sites in the vertebrate long bone – the primary (diaphyseal) and the secondary (epiphyseal) sites of ossification. Bone development initiates at the primary site.
How the endochondral ossification occurs give an example?
Endochondral ossification At such sites the cartilage begins to undergo hypertrophy and calcification, allowing the penetration of blood vessels which bring with them the osteoblast and bone marrow precursors. This is therefore an example of endochondral ossification.
What are the 4 steps of endochondral ossification?
The following stages are: (a) Mesenchymal cells differentiate into chondrocytes. (b) The cartilage model of the future bony skeleton and the perichondrium form. (c) Capillaries penetrate cartilage. Perichondrium transforms into periosteum.
How many stages are there in endochondral ossification?
Endochondral ossification can be divided into five stages: commitment, compaction, proliferation, growth, and finally, chondrocyte death and the generation of new bone. Phases 1 and 2: commitment and compaction. First, the mesenchymal cells commit to becoming cartilage (Figure 1A).
Which are the last three stages of endochondral ossification?
The following stages are: (a) Mesenchymal cells differentiate into chondrocytes. (b) The cartilage model of the future bony skeleton and the perichondrium form. (c) Capillaries penetrate cartilage.
Why is endochondral ossification important?
Endochondral bone formation is an important aspect of osteophyte development and growth. Endochondral bone formation is a specific, well-orchestrated process that allows long bones to grow; replaces cartilage with normal bone tissue; and is usually associated with fetal, childhood, and pubertal growth.
Why does endochondral ossification occur?
Endochondral ossification is one of the two essential processes during fetal development of the mammalian skeletal system by which bone tissue is created. Unlike intramembranous ossification, which is the other process by which bone tissue is created, cartilage is present during endochondral ossification.
Which bone is formed through endochondral ossification?
All of the bones of the body, except for the flat bones of the skull, mandible, and clavicles, are formed through endochondral ossification.
How many steps are in the endochondral ossification?
2 – Endochondral Ossification: Endochondral ossification follows five steps. (a) Mesenchymal cells differentiate into chondrocytes that produce a cartilage model of the future bony skeleton.
What causes endochondral ossification?
Endochondral ossification is the process by which bone tissue is formed in early fetal development. It begins when mesenchymal stem cells (MSC’s) start to produce a cartilage template of long bones, such as the femur and the tibia, upon which bone morphogenesis occurs (Ortega et al., 2004).
Where is endochondral ossification found?
Endochondral ossification is the process of bone formation in which cartilage scaffolds, arranged in zones, are gradually replaced by bone. It occurs at the articular/epiphyseal and metaphyseal growth plates and at secondary centers of ossification, such as the carpal and tarsal bones.
Where are endochondral bones found?
What is an example of an endochondral bone?
Endochondral ossification is the process by which bone tissue is formed in early fetal development. It begins when MSCs start to produce a cartilage template of long bones, such as the femur and the tibia, upon which bone morphogenesis occurs.