Where does Appositional growth occur?
Where does Appositional growth occur?
endosteum
Appositional growth can occur at the endosteum or peristeum where osteoclasts resorb old bone that lines the medullary cavity, while osteoblasts produce new bone tissue.
Where is appositional cartilage growth?
perichondrium
In appositional growth, new cartilage is laid down at the surface of the perichondrium. In this process, chondroblasts of the perichondrium, which are precursors to chondrocytes, form an extracellular matrix and develop into mature chondrocytes.
Where do interstitial and appositional growth of cartilage occur?
Moreover, interstitial growth occurs within the lacunae while appositional growth occurs on the surface of pre-existing cartilage. Cartilages lengthen and is replaced by bone tissue during the interstitial growth while new bone tissue deposit on the surface of existing bone during the appositional growth.
What hormone controls bone growth?
The growth hormone/IGF-1 system stimulates both the bone-resorbing and bone-forming cells, but the dominant effect is on bone formation, thus resulting in an increase in bone mass. Thyroid hormones increase the energy production of all body cells, including bone cells.
Can cartilage repair itself?
While cartilage is very beneficial to the body, it does have a drawback: it doesn’t heal itself as well as most other tissues. The cartilage cells known as chondrocytes do not often replicate or repair themselves, which means damaged or injured cartilage will not likely heal well without medical intervention.
Is lamellae present in cartilage?
Cartilage and Bone: Types of mature bone The osteocytes sit in their lacunae in concentric rings around a central Haversian canal (which runs longitudinally). The osteocytes are arranged in concentric rings of bone matrix called lamellae (little plates), and their processes run in interconnecting canaliculi.
What is the function of lacunae in cartilage?
The primary function of lacuna in bone or cartilage is to provide housing to the cells it contains and keeps the enclosed cells alive and functional. In bones, lacunae encase osteocytes; in cartilage, lacunae enclose chondrocytes.
What is the difference between interstitial and appositional growth of cartilage?
Cartilage can grow in two ways: Interstitial growth – chondrocytes grow and divide and lay down more matrix inside the existing cartilage. Appositional growth – new surface layers of matrix are added to the pre-existing matrix by new chondroblasts from the perichondrium.
What do fibroblasts do bone repair?
Fibroblasts produce collagen fibers that connect the broken bone ends, while osteoblasts start to form spongy bone. The repair tissue between the broken bone ends, the fibrocartilaginous callus, is composed of both hyaline and fibrocartilage.
