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Classification of Bones

Classification of Bones

The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The...

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...

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...

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...

Changes in the Appendicular Skeleton with Age

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...

Bone Formation by Endochondral Ossification

Bone Formation by Endochondral Ossification

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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Related Experiment Video

Updated: Apr 6, 2026

Non-invasive Skeletal Muscle Quantification in Small Animals Using Micro-computed Tomography

Non-invasive Skeletal Muscle Quantification in Small Animals Using Micro-computed Tomography

Published on: November 8, 2024

Make No Bones about It: Long Bones Scale Isometrically.

Caitlin Sedwick¹

¹Freelance Science Writer, San Diego, California, United States of America.

|August 5, 2015

Summary

This summary is machine-generated.

This study reveals that long bone growth is isometric, meaning features maintain their relative positions. This process minimizes positional drift during development, ensuring proper skeletal structure.

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Last Updated: Apr 6, 2026

Non-invasive Skeletal Muscle Quantification in Small Animals Using Micro-computed Tomography

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

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Culturing and Measuring Fetal and Newborn Murine Long Bones

Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

Area of Science:

Developmental biology
Biomechanics
Orthopedics

Background:

Long bones are complex structures, not simple cylinders.
Understanding how their features maintain relative positioning during growth is crucial.

Purpose of the Study:

To investigate the growth patterns of long bones.
To determine if growth is isometric and how positional accuracy is maintained.

Main Methods:

Analysis of long bone growth.
Quantitative assessment of feature positioning during development.

Main Results:

Long bone growth was found to be isometric.
Minimal drift in the relative positioning of bone features was observed.

Conclusions:

Isometric growth is key to maintaining the structural integrity of long bones.
The skeletal system effectively minimizes positional errors during development.