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Related Concept Videos

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 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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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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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 Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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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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Related Experiment Video

Updated: Jun 29, 2025

Author Spotlight: Advanced Techniques for Characterizing Tissue Mineralization in Bone Regeneration Research
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Author Spotlight: Advanced Techniques for Characterizing Tissue Mineralization in Bone Regeneration Research

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Vertebrate mineralized tissues: A modular structural analysis.

Steve Weiner1, Ron Shahar2

  • 1Department of Chemical and Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel.

Acta Biomaterialia
|April 1, 2024
PubMed
Summary
This summary is machine-generated.

A new modular approach analyzes vertebrate mineralized tissues like bone and scales. This method identifies common structural components across diverse tissues, aiding comparisons and understanding their function and evolution.

Keywords:
BoneCollagen fibril bundlesFIB SEMModular classificationScalesTooth

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High-Throughput, Multi-Image Cryohistology of Mineralized Tissues
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High-Throughput, Multi-Image Cryohistology of Mineralized Tissues

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Area of Science:

  • * Mineralized tissue research
  • * 3D structural biology
  • * Comparative anatomy

Background:

  • * Vertebrate mineralized tissues (bone, teeth, scales) exhibit complex 3D hierarchical structures.
  • * Advanced imaging techniques like FIB-SEM reveal intricate details of mineralized collagen fibrils and their organization.
  • * Existing hierarchical descriptions lack a framework for comparing diverse tissue structures.

Purpose of the Study:

  • * Propose a novel modular approach to analyze vertebrate mineralized tissues.
  • * Complement the existing hierarchical approach with a focus on material textures, pore characteristics, and mineralization extents.
  • * Facilitate comparative studies across different mineralized tissues.

Main Methods:

  • * Characterization of 3D hierarchical structures in mineralized tissues.
  • * Application of a modular analysis framework focusing on textures, pores, and mineralization.
  • * Case studies involving bone, dentin, and scales to demonstrate the approach.

Main Results:

  • * Identification of common structural modules (textures, pore shapes/sizes, mineralization extents) across different mineralized tissues.
  • * Demonstration that these modules can be organized differently in various tissues.
  • * Case studies highlight the presence of similar modules in bone, dentin, and scales.

Conclusions:

  • * The modular approach provides a systematic basis for comparing diverse vertebrate mineralized tissues.
  • * This framework can address questions about structure-function relationships, developmental pathways, and evolutionary origins.
  • * Enables insights into how similar functions may arise from different structural organizations.