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Bone Structure

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.

Gross Anatomy of Bone

Gross Anatomy of Bone

The two main features of a long bone are the diaphysis and the epiphysis.
The diaphysis is the tubular shaft that runs between the proximal and distal ends of the bone. The walls of the diaphysis are composed of dense and hard compact bone made of numerous osteons — the functional unit of the compact bone. The hollow region in the diaphysis is called the medullary cavity, which harbors the bone marrow. In infants and children, this marrow cavity is filled with red marrow, whereas in adults, it...

Compact Bone

Compact Bone

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...

Spongy Bone

Spongy Bone

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...

Bone as Supporting Connective Tissue

Bone as Supporting Connective Tissue

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— that give the...

The Bone Matrix

The Bone Matrix

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 acid or...

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Related Experiment Video

Updated: May 11, 2026

Outer-Boundary Assisted Segmentation and Quantification of Trabecular Bones by an Imagej Plugin

Outer-Boundary Assisted Segmentation and Quantification of Trabecular Bones by an Imagej Plugin

Published on: March 14, 2018

Computational anatomy in the study of bone structure.

Julio Carballido-Gamio¹, Daniel P Nicolella

¹Department of Radiology and Biomedical Imaging, University of California, San Francisco, 185 Berry St, Suite 350, San Francisco, CA, 94107, USA, Julio.Carballido-Gamio@ucsf.edu.

Current Osteoporosis Reports

|June 1, 2013

Summary

Computational anatomy offers a novel approach to assess bone structure, improving osteoporosis diagnosis and treatment. This method provides a more comprehensive analysis of the proximal femur than traditional techniques.

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Analysis and Imaging of Osteocytes

Analysis and Imaging of Osteocytes

Published on: November 29, 2024

Area of Science:

Biomedical Engineering
Radiology
Orthopedics
Computational Anatomy

Background:

Osteoporosis poses a significant public health challenge, leading to substantial healthcare costs due to osteoporotic fractures.
Bone strength is determined by bone size, shape, mass distribution, and material quality.
Conventional imaging analysis for osteoporosis relies on predefined regions of interest, limiting comprehensive structural assessment.

Purpose of the Study:

To review studies utilizing computational anatomy for investigating proximal femur structure in relation to osteoporosis.
To explore the application of computational anatomy in assessing factors such as age, fracture risk, treatment efficacy, and spaceflight effects on bone health.

Main Methods:

Application of computational anatomy, a suite of imaging-based analysis algorithms, for unbiased, whole-structure assessment.
Analysis of high-resolution scans of anatomical sites, specifically the proximal femur.
Investigation of relationships between computational anatomy-derived structural parameters and clinical factors.

Main Results:

Computational anatomy enables a more complete assessment of bone structure compared to conventional methods.
This approach allows for analyses not limited by predefined regions of interest.
Studies demonstrate the utility of computational anatomy in understanding bone changes related to aging, fracture, treatment, and spaceflight.

Conclusions:

Computational anatomy is a promising technique for advancing osteoporosis research and clinical assessment.
It offers a more comprehensive and unbiased evaluation of bone structure, particularly the proximal femur.
Further research using computational anatomy can enhance our understanding of osteoporosis and inform therapeutic strategies.