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Related Concept Videos

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...
Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
Functional Classification of Joints01:09

Functional Classification of Joints

Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...
Structural Classification of Joints01:20

Structural Classification of Joints

Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
Joints01:26

Joints

Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
Structural joint classifications are based on the material that makes up the joint as well as whether or not the joint contains a space between the bones. Joints are structurally classified as fibrous, cartilaginous, or synovial.
Fibrous Joints Are Immovable
The bones of a...
Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary or...

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Related Experiment Video

Updated: Jul 15, 2026

A Pre-Clinical Model of Synovitis Using Ex vivo Human Synovial Tissue with Preserved Function and Architecture
08:32

A Pre-Clinical Model of Synovitis Using Ex vivo Human Synovial Tissue with Preserved Function and Architecture

Published on: March 20, 2026

The development of synovial joints.

I M Khan1, S N Redman, R Williams

  • 1Cardiff School of Biosciences, Cardiff University, Cardiff CF103US, Wales, United Kingdom.

Current Topics in Developmental Biology
|May 15, 2007
PubMed
Summary

Synovial joint formation is crucial for vertebrate limb adaptation. Understanding joint development, including molecular signals and cell behaviors, is key to addressing arthritis and improving regenerative therapies.

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Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue

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Synovial Fluid Analysis to Identify Osteoarthritis
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Synovial Fluid Analysis to Identify Osteoarthritis

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Related Experiment Videos

Last Updated: Jul 15, 2026

A Pre-Clinical Model of Synovitis Using Ex vivo Human Synovial Tissue with Preserved Function and Architecture
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A Pre-Clinical Model of Synovitis Using Ex vivo Human Synovial Tissue with Preserved Function and Architecture

Published on: March 20, 2026

Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue
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Isolation and Culture of Primary Synovial Macrophages and Fibroblasts from Murine Arthritis Tissue

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Synovial Fluid Analysis to Identify Osteoarthritis
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Synovial Fluid Analysis to Identify Osteoarthritis

Published on: October 20, 2022

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Orthopedics

Background:

  • Synovial joints enable limb articulation and load transmission in vertebrates.
  • Joints form via sequential branching and segmentation of precartilaginous elements.
  • Articular cartilage's avascular nature limits repair, leading to widespread arthritis.

Purpose of the Study:

  • To explore the molecular mechanisms and cellular processes underlying synovial joint development.
  • To investigate the roles of specific signaling pathways (wnt14, gdf5) in joint specification.
  • To highlight the importance of understanding joint development for therapeutic advancements.

Main Methods:

  • Analysis of vertebrate limb evolution and adaptation.
  • Study of cell density, inductive signals, and molecular pathways (wnt14, gdf5) in joint formation.
  • Investigation of joint cavitation and morphogenesis through extracellular matrix molecule analysis.

Main Results:

  • Joint positioning is initially determined by interzones and subsequently by wnt14 and gdf5 signaling.
  • Joint cell fate is specified but can be altered by growth factor perturbations, leading to fusion.
  • The extracellular matrix of forming joints plays a critical role in morphogenesis.

Conclusions:

  • Detailed understanding of synovial joint development is essential for advancing therapeutic strategies for joint pathologies.
  • Recent discoveries in stem cell biology offer new avenues for treating conditions like arthritis.
  • Further research into joint development mechanisms will enhance regenerative medicine approaches.