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.
Contents
- 1 What forms first in endochondral ossification?
- 2 What cell types are involved in endochondral ossification?
- 3 What are the steps of endochondral bone formation?
- 4 What is Intramembranous and endochondral ossification?
- 5 When does endochondral ossification begin?
- 6 Is phalanges endochondral ossification?
- 7 What tissue forms the model for endochondral ossification quizlet?
- 8 Where does endochondral lengthening occur?
- 9 How is the beginning of Intramembranous ossification different from endochondral ossification?
- 10 How are bones formed in embryonic development?
- 11 Where does bone formation occur during endochondral ossification quizlet?
- 12 What is the difference between intramembranous ossification and endochondral ossification quizlet?
- 13 What is the function of the osteogenic cells osteoblasts osteoclasts and osteocytes in ossification?
- 14 How do bones form?
What forms first in endochondral ossification?
Endochondral ossification begins with mesenchymal tissue transforming into a cartilage intermediate, which is later replaced by bone and forms the remainder of the axial skeleton and the long bones.
What cell types are involved in 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 steps of endochondral bone formation?
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.
What is Intramembranous and endochondral ossification?
In intramembranous ossification, bone develops directly from sheets of mesenchymal connective tissue. In endochondral ossification, bone develops by replacing hyaline cartilage. Activity in the epiphyseal plate enables bones to grow in length. Remodeling occurs as bone is resorbed and replaced by new bone.
When does endochondral ossification begin?
By the sixth or seventh week of embryonic life, the actual process of bone development, ossification (osteogenesis), begins. There are two osteogenic pathways—intramembranous ossification and endochondral ossification—but bone is the same regardless of the pathway that produces it.
Is phalanges endochondral ossification?
The term endochondral refers to the close association of the developing bone with the pre-existing hyaline cartilage model of that bone. The long bones of the limbs (including the phalanges) and the ribs develop by endochondral ossification.
What tissue forms the model for endochondral ossification quizlet?
Endochondral ossification converts hyaline cartilage “bone” models into true bones (i.e., hyaline cartilage serves as a template for bone formation). Endochondral ossification occurs within fibrous connective tissue membranes.
Where does endochondral lengthening occur?
Both endochondral and perichondral bone growth both take place toward epiphyses and joints. In the bone lengthening process during endochondral ossification depends on the growth of epiphyseal cartilage. When the epiphyseal line has been closed, the bone will not increase in length.
How is the beginning of Intramembranous ossification different from endochondral ossification?
The main difference between endochondral ossification and intramembranous ossification is that the endochondral ossification is the method of forming a bone through a cartilage intermediate while the intramembranous ossification directly forms the bone on the mesenchyme.
How are bones formed in embryonic development?
Early in gestation, a fetus has a cartilaginous skeleton from which the long bones and most other bones gradually form throughout development and for years after birth in a process called endochondral ossification. Ossification or osteogenesis is the process of laying new bone material by cells called osteoblasts.
Where does bone formation occur during endochondral ossification quizlet?
First, the bone collar forms around the diaphysis of the hyaline cartilage model. Then, cartilage in the center of the diaphysis calcifies and develops cavities.
What is the difference between intramembranous ossification and endochondral ossification quizlet?
what is the difference between Intramembranous ossification and endochondral ossification? INTRAMEMBRANOUS OSSIFICATION: forms the flat bones of the skull, face, jaw, and center of clavicle. ENDOCHONDRAL OSSIFICATION: forms most bones in the body, mostly long bones, and replace cartilage with bone.
What is the function of the osteogenic cells osteoblasts osteoclasts and osteocytes in ossification?
The osteoblast, osteoclast, osteocyte, and osteoprogenitor bone cells are responsible for the growing, shaping, and maintenance of bones.
How do bones form?
Ossification is achieved by bone-forming cells called osteoblasts (osteo- means “bone” in Greek). The old osteoblasts produce bone tissue, which is also called osteotissue, and also secrete the enzyme phosphatase which allows calcium salts to be deposited in the newly formed bone tissue.