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Related Concept Videos

Bone Formation by Endochondral Ossification01:24

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...
Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
Changes in the Appendicular Skeleton with Age01:09

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 Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
Bone Remodeling01:40

Bone Remodeling

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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Related Experiment Video

Updated: May 15, 2026

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
07:23

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

Development of the endochondral skeleton.

Fanxin Long1, David M Ornitz

  • 1Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA. flong@wustl.edu

Cold Spring Harbor Perspectives in Biology
|January 4, 2013
PubMed
Summary
This summary is machine-generated.

Understanding endochondral ossification, crucial for bone development and skeletal diseases, involves key extracellular signals and transcription factors. Mouse studies reveal critical molecular regulators of chondrocyte and osteoblast biology.

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Culturing and Measuring Fetal and Newborn Murine Long Bones
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Culturing and Measuring Fetal and Newborn Murine Long Bones

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Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells
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Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells

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Related Experiment Videos

Last Updated: May 15, 2026

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
07:23

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

Culturing and Measuring Fetal and Newborn Murine Long Bones
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Culturing and Measuring Fetal and Newborn Murine Long Bones

Published on: April 26, 2019

Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells
06:05

Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells

Published on: July 14, 2023

Area of Science:

  • Skeletal biology and developmental genetics.
  • Molecular mechanisms of endochondral ossification.

Background:

  • Endochondral ossification forms most mammalian bones from cartilage.
  • Understanding this process is vital for skeletal diseases, injury, and aging.

Purpose of the Study:

  • To review molecular mechanisms controlling endochondral bone development.
  • Integrate knowledge of extracellular signals and transcription factors.

Main Methods:

  • Review of mouse genetic studies from the past 15 years.
  • Analysis of secreted proteins (IHH, PTHrP, BMPs, WNTs, FGFs) and transcription factors (SOX9, RUNX2, OSX).

Main Results:

  • Identified key roles for secreted proteins and transcription factors in chondrocyte and osteoblast biology.
  • Detailed molecular pathways regulating chondrogenesis and osteogenesis.

Conclusions:

  • Extracellular signals and transcription factors are critical regulators of endochondral skeleton development.
  • Integrated review provides a foundation for future research in skeletal biology.