What is the difference between interstitial and appositional bone growth?
Interstitial growth is the increase in the length of bones by the cartilage lengthening and is replacing by bone tissue while appositional growth is the increase in the diameter of bones by the addition of bony tissue at the surface of the pre-existing bone.
What is appositional bone growth interstitial bone growth?
Growth in bones occurs in two ways either longitudinally or increase in the width of bone size. This increase in the length size of the bone is referred as interstitial growth whereas the increase in the preexisting diameter or width size of bones is referred as appositional growth.
What is Appositional growth?
n. Growth by the addition of new layers on those previously formed, characteristic of tissues formed of rigid materials.
Where does interstitial growth happen in the bones?
In endochondral ossification, bone develops by replacing hyaline cartilage. Activity in the epiphyseal plate enables bones to grow in length (this is interstitial growth).
What does Appositional growth produce?
During appositional growth, osteoclasts resorb old bone that lines the medullary cavity, while osteoblasts, via intramembranous ossification, produce new bone tissue beneath the periosteum. Mesenchymal stem cell migration and differentiation are two important physiological processes in bone formation.
What happens in interstitial cartilage growth?
In interstitial growth, chondrocytes secrete new matrix within the cartilage and this causes it to grow in length.
What causes Appositional growth?
The process of appositional growth occurs when the cartilage model also grows in thickness due to the addition of more extracellular matrix on the peripheral cartilage surface, which is accompanied by new chondroblasts that develop from the perichondrium.
How does appositional bone growth occur?
Appositional growth is the increase in the diameter of bones by the addition of bone tissue at the surface of bones. Bone remodeling involves the processes of bone deposition by osteoblasts and bone resorption by osteoclasts.
What is appositional growth of cartilage?
Appositional growth occurs when chondroblasts secrete new matrix along existing surfaces and this causes the cartilage to expand and widen. In interstitial growth, chondrocytes secrete new matrix within the cartilage and this causes it to grow in length.
Interstitial growth produces longer bones as the cartilage lengthens and is replaced by bone tissue, while appositional growth occurs when new bone tissue is deposited on the surface of the bone, resulting in bone thickening.
What is interstitial ossification and interstitial growth?
Interstitial growth is similar to endochondral ossification in that it needs cartilage to be present in order to happen. An increase in length happens through events at four distinct locations: At the proliferation zone, cells pile themselves up and divide quickly. This pushes the epiphyses away from the diaphysis.
What is interstitial growth in a tissue?
This growth within a tissue is called interstitial growth. Most of the chondrocytes in the zone of calcified matrix, the zone closest to the diaphysis, are dead because the matrix around them has calcified, restricting nutrient diffusion.
What is the longitudinal growth of bone?
The longitudinal growth of bone is a result of cellular division in the proliferative zone and the maturation of cells in the zone of maturation and hypertrophy. This growth within a tissue is called interstitial growth.