What are the 5 steps of endochondral ossification in order?
Endochondral Ossification
- Reserve Zone. Storage site for lipids, glycogen, proteoglycan.
- Proliferative Zone. Proliferating chondrocytes leading to longitudinal growth.
- Hypertrophic Zone. Site of chondrocyte maturation.
- Primary Spongiosa. Site for mineralization to form woven bone.
- Secondary Spongiosa.
What occurs during endochondral ossification?
The process of endochondral ossification. (a) During endochondral ossification, mesenchymal cells differentiate into chondrocytes and lead to the formation of cartilage templates. Vascularization occurs around these templates, and osteoblasts differentiate around the central area in the bone collar.
What are the 5 zones of endochondral ossification?
Enlargement of the epiphysis occurs by growth of the articular cartilage. Again, observe the zones of reserve cells, proliferation, maturation, hypertrophy, calcification, ossification and resorption.
What is the correct order of endochondral ossification?
1) Enlarged chondrocytes die. 2) Osteoblasts replace calcified cartilage with spongy bone. 3) Chondrocytes enlarge and the surrounding matrix begins to calcify. 4) Blood vessels grow around the edges of the cartilage.
What are the 7 steps of endochondral ossification?
Terms in this set (7)
- enlargement of cartilage in chondrocytes.
- blood vessels grow into shaft.
- fibroblasts migrate to bone center and differentiate into osteoblasts.
- bone enlarges.
- centers of epiphysis calcify.
- epiphysis fills with spongy bone.
- during puberty: cartilage production slows while osteoblast activity increases.
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.
What happens during endochondral ossification quizlet?
Week 9 – Bone collar forms around hyaline cartilage model; A bone collar is laid down around the diaphysis fo the hyaline cartilage model. Osteoblasts of the newly converted periosteum secrete osteiod against the hyaline cartilage diaphysis, encasing it in bone.
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.
What are the 6 steps of 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.
How is endochondral bone formed?
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 four steps of endochondral ossification?
What cells are responsible for endochondral ossification?
Osteoblasts are bone-forming cells, osteocytes are mature bone cells and osteoclasts break down and reabsorb bone. There are two types of ossification: intramembranous and endochondral.
What bones are formed by endochondral ossification?
Endochondral ossification is the mechanism responsible for the formation of all long bones of the axial skeleton (vertebrae and ribs) and the appendicular skeleton (limbs).