What is woven bone tissue?

What is woven bone tissue?

Woven bone cells are referred to as osteoblasts when surrounded by a randomly oriented loosely packed collagen matrix since they continue to synthesise matrix; they become woven bone osteocytes when the woven bone is encased by lamellar bone.

Where is woven bone?

‘Woven bone can be found in the embryonic skeleton and in cortical and cancellous bone in states of rapid bone growth, bone replacement, or high bone turnover. It is replaced in the normal skeleton by lamellar bone after completion of growth.

What is woven bone histology?

Bone development begins with the replacement of collagenous mesenchymal tissue by bone. This results in the formation of woven bone, a primitive form of bone with randomly organized collagen fibers that is further remodeled into mature lamellar bone, which possesses regular parallel rings of collagen.

What characterizes woven bone?

Primary bone (or woven bone) is characterized by the irregular arrangement of collagen fibers, large cell number, and reduced mineral content. Note the primary bone is deposited on hyaline cartilage. Primary bone is acidophilic while the hyaline cartilage is basophilic.

What is woven bone cancellous bone?

At the microscopic level, trabecular and cortical bones consist of two forms: woven and lamellar. Woven bone is immature bone or primitive bone and is found in the embryo, the newly born and in fracture healing. Woven bone has a matrix of interwoven coarse collagen fibers with osteocytes distributed at random.

Is woven bone calcified?

Woven bone is characterized by irregular bundles of collagen fibers, large and numerous osteocytes, and delayed, disorderly calcification which occurs in irregularly distributed patches.

Is woven bone strong?

Woven bone: characterized by a haphazard organization of collagen fibres and is mechanically weak. Lamellar bone: characterized by a regular parallel alignment of collagen into sheets (lamellae) and is mechanically strong.

What type of collagen is in woven bone?

Type I collagen is the main component of the organic matrix of bone, dentine, and cementum, the thin layer of calcified tissue that covers the roots of teeth and anchors them to the jaw.

Where is hydroxyapatite found in the body?

bone
Hydroxyapatite is present in bone and teeth; bone is made primarily of HA crystals interspersed in a collagen matrix—65 to 70% of the mass of bone is HA. Similarly HA is 70 to 80% of the mass of dentin and enamel in teeth.

What is the biological significance of woven bone?

The under-appreciated biological significance of woven bone is that it initiates formation de novoat sites of no previous bone. This information allows for targeted assessment of molecular-biophysical mechanisms underlying woven bone formation and their utilisation for initiating enhanced bone formation.

What is the difference between woven bone and lamellar bone?

The osteocytes (black arrows) in woven bone are rounder than those in lamellar bone, however. Areas of woven bone are still present in the center of this image. A wide linear band of lamellae is present at the right side of this image at the exterior surface.

What is bone tissue?

Bone is a specialized connective tissue consisting of cells, fibers and ground substance. Unlike other connective tissues, its extracellular components are mineralized giving it substantial strength and rigidity.

What is the difference between plexiform and woven bone?

Like woven bone, plexiform bone is formed more rapidly than primary or secondary lamellar bone tissue. However, unlike woven bone, plexiform bone must offer increased mechanical support for longer periods of time. Because of this, plexiform bone is primarily found in large rapidly growing animals such as cows or sheep.