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Related Concept Videos

Compact Bone01:27

Compact Bone

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Spongy Bone01:09

Spongy Bone

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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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The Bone Matrix01:18

The Bone Matrix

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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Bone Cells and Tissue01:30

Bone Cells and Tissue

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the...
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Bone as Supporting Connective Tissue01:23

Bone as Supporting Connective Tissue

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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts—...
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Related Experiment Video

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Analysis and Imaging of Osteocytes
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Analysis and Imaging of Osteocytes

Published on: November 29, 2024

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Quantifying the osteocyte network in the human skeleton.

Pascal R Buenzli1, Natalie A Sims2

  • 1School of Mathematical Sciences, Monash University, Clayton, VIC 3800, Australia.

Bone
|February 25, 2015
PubMed
Summary
This summary is machine-generated.

The human skeleton contains 42 billion osteocytes forming a vast network with 3.7 trillion projections. This intricate cellular communication system is crucial for skeletal regulation and dynamic bone remodeling.

Keywords:
Lacuno-canalicular networkMathematical modellingOsteocyte

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Area of Science:

  • Skeletal Biology
  • Cellular Network Analysis
  • Biophysics

Background:

  • Osteocytes form an extensive cellular network within the skeleton, regulating its structure.
  • Previous imaging limitations have hindered a full understanding of the osteocyte network's magnitude and complexity.

Purpose of the Study:

  • To estimate the quantity and complexity of the human osteocyte network using new imaging data.
  • To provide a comprehensive understanding of the human osteocyte network's extent and nature.

Main Methods:

  • Analysis of data from recent imaging techniques.
  • Estimation of osteocyte numbers and dendritic projections.
  • Mathematical modeling of canalicular density and process branching.

Main Results:

  • The human skeleton contains an estimated 42 billion osteocytes with 3.7 trillion dendritic projections.
  • The network comprises 23 trillion connections, extending 175,000 km, with a surface area of 215 m².
  • Daily replenishment of 9.1 million osteocytes highlights the network's dynamic nature.

Conclusions:

  • The osteocyte network is a vast and complex communication system, comparable in scale to the brain's neural network.
  • The continuous renewal of osteocytes facilitates rapid integration of therapeutic changes into the skeleton.