What connective tissue is formed by osteocytes?
What connective tissue is formed by osteocytes?
Bone
The bone is a specialized form of connective tissue in which the extracellular components are mineralized. Like other connective tissues, bone is composed of cells (osteogenic cells, osteoblasts, osteocytes, osteoclasts) and matrix (a mixture of collagen fibers, ground substance and mineral salts).
What is osteoblast mineralization?
Mineralization is the most fundamental process in vertebrates. It is predominantly mediated by osteoblasts, which secrete mineral precursors, most likely through matrix vesicles (MVs). These vesicular structures are calcium and phosphate rich and contain organic material such as acidic proteins.
How are osteocytes and osteoblasts formed?
OSTEOCYTES are cells inside the bone. They also come from osteoblasts. Some of the osteoblasts turn into osteocytes while the new bone is being formed, and the osteocytes then get surrounded by new bone. They are not isolated, however, because they send out long branches that connect to the other osteocytes.
What type of tissue is osteoblast?
Osteoblasts form a closely packed sheet on the surface of the bone, from which cellular processes extend through the developing bone. They arise from the differentiation of osteogenic cells in the periosteum, the tissue that covers the outer surface of the bone, and in the endosteum of the marrow cavity.
How osteocytes are formed?
Osteocytes are formed when osteoblasts are encased in bone matrix during bone formation. These cells become connected with one another, and with cells outside the mineralized matrix, to create a living network.
What are the functions of osteocytes osteoblasts and osteoclasts?
Bone tissue is continuously remodeled through the concerted actions of bone cells, which include bone resorption by osteoclasts and bone formation by osteoblasts, whereas osteocytes act as mechanosensors and orchestrators of the bone remodeling process.
How are osteoblasts formed?
These bone-forming cells are formed when osteogenic cells differentiate in a tissue covering the outer surface of bone, called the periosteum. They also arise from osteogenic cell differentiation occurring in the endosteum, a structure found in the middle of bone and in the bone marrow.
How do osteocytes obtain nourishment?
Osteocytes receive nutrients and eliminate wastes through blood vessels in the compact bone. Blood vessels in the periosteum and endosteum supply blood to blood vessels in the central canals. Nutrients leave the blood vessels of the central canals and diffuse to the osteocytes through the canaliculi.
How are osteocytes formed?
What is the difference between osteoblasts and osteocytes?
Osteoblasts are the cells that produce bone extracellular matrix and are responsible for its mineralization. Osteocytes are osteoblasts that have been incorporated into bone matrix and are cells with extensive dendritic processes through which the cells communicate with other osteocytes and with osteoblasts.
What is the role of osteocytes osteoblasts and osteoclasts in bone repair?
What are osteocytes responsible for?
The potential functions of osteocytes include: to respond to mechanical strain and to send signals of bone formation or bone resorption to the bone surface, to modify their microenvironment, and to regulate both local and systemic mineral homeostasis.
What makes up the connective tissue of the bone?
The bone is a specialized form of connective tissue in which the extracellular components are mineralized. Like other connective tissues, bone is composed of cells (osteogenic cells, osteoblasts, osteocytes, osteoclasts) and matrix (a mixture of collagen fibers, ground substance and mineral salts).
How are osteoclasts and osteoblasts related to bone resorption?
Moreover, osteocytes produce factors that influence osteoblast and osteoclast activities, whereas osteocyte apoptosis is followed by osteoclastic bone resorption. The increasing knowledge about the structure and functions of bone cells contributed to a better understanding of bone biology.
How are bone cells involved in bone remodeling?
Recently, it has been recognized that, during bone remodeling, there are an intricate communication among bone cells. For instance, the coupling from bone resorption to bone formation is achieved by interaction between osteoclasts and osteoblasts.
Where are osteoblasts found in the human body?
Osteoblasts are found in large numbers in the periosteum, the thin connective tissue layer on the outside surface of bones, and in the endosteum. Normally, almost all of the bone matrix, in the air breathing vertebrates, is mineralized by the osteoblasts.
