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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...
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...
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 Remodeling and Repair01:31

Bone Remodeling and Repair

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...

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Related Experiment Video

Updated: Jun 12, 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

FGFs in endochondral skeletal development.

Catherine R Degnin1, Melanie B Laederich, William A Horton

  • 1Shriners Hospital and Molecular & Medical Genetics and Cell & Developmental Biology, Oregon Health & Sciences University, Portland, Oregon 97239, USA.

Journal of Cellular Biochemistry
|June 22, 2010
PubMed
Summary
This summary is machine-generated.

Fibroblast growth factors (FGFs) and FGF receptors (FGFRs) are crucial for skeletal development via endochondral ossification. Recent findings illuminate how these signals are initiated, propagated, and modulated during this process.

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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: Jun 12, 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
06:58

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:

  • Developmental Biology
  • Skeletal Biology
  • Cell Signaling

Background:

  • Mammalian skeletal development occurs via membranous and endochondral ossification.
  • Fibroblast growth factors (FGFs) and their receptors (FGFRs) regulate both ossification pathways.
  • The precise mechanisms of FGF signaling in skeletal development are not fully understood.

Purpose of the Study:

  • To review the current understanding of FGF signaling in endochondral ossification.
  • To highlight recent advancements in the field.
  • To focus on signal initiation, propagation, and modulation.

Main Methods:

  • Literature review of recent studies on FGF signaling in skeletal development.
  • Focus on endochondral ossification processes.
  • Analysis of emerging concepts and findings.

Main Results:

  • FGF signaling plays a critical role in regulating chondrocyte differentiation and proliferation.
  • Specific FGFRs are essential for proper long bone formation and patterning.
  • Emerging research reveals complex crosstalk between FGF pathways and other signaling molecules.

Conclusions:

  • FGF/FGFR signaling is indispensable for endochondral skeletal development.
  • Continued research is vital to fully elucidate the intricate regulatory networks.
  • Understanding these pathways offers potential for therapeutic interventions in skeletal disorders.