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Related Concept Videos

Functional Classification of Joints01:09

Functional Classification of Joints

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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...
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Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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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...
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Introduction to Joints00:58

Introduction to Joints

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The adult human body usually has 206 bones, and except for the hyoid bone in the neck, each bone is connected to at least one other bone. Joints are the location where bones come together. Many joints allow for movement between the bones. At these joints, the articulating surfaces of the adjacent bones can move smoothly against each other. However, the bones of other joints may be joined by connective tissue or cartilage. These joints are designed for stability and provide little or no...
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Structural Classification of Joints01:20

Structural Classification of Joints

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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...
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Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

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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...
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Joints01:26

Joints

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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...
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In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint
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Relationship between joint shape and function as revealed through ex vivo XROMM.

Robert J Brocklehurst1, L Fahn-Lai1,2, Andrew Biewener2

  • 1Museum of Comparative Zoology, Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.

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Joint shape doesn't always predict mobility in vertebrates. Researchers found that a ball-and-socket shoulder joint in opossums was less mobile than other joint types in lizards, challenging traditional classifications.

Keywords:
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Area of Science:

  • Comparative biomechanics
  • Vertebrate anatomy and evolution

Background:

  • Skeletal joint morphology and articulation type are traditionally used to infer function in vertebrate movement.
  • Existing classification schemes may not accurately predict joint mobility across diverse vertebrate species.

Purpose of the Study:

  • To test the relationship between skeletal joint form and function.
  • To investigate if joint morphology alone can predict mobility and movement capabilities.

Main Methods:

  • Collected marker-based X-ray motion (XROMM) data from the shoulder and elbow joints of tegu lizards and Virginia opossums.
  • Measured 3D rotational and translational mobility at each joint.
  • Compared experimental mobility data against predictions based on articular morphology.

Main Results:

  • The opossum's ball-and-socket shoulder joint exhibited a smaller range of motion than the tegu's hemi-sellar shoulder and condylar elbow joints.
  • The ball-and-socket joint had a less complex mobility envelope, facilitating easier pose transitions.
  • The opossum's hinge elbow joint was the least mobile, aligning with predictions.
  • All joints showed coupled rotational and translational motion.

Conclusions:

  • Joint morphology alone is insufficient to fully predict joint mobility; soft tissues and other factors are crucial.
  • Traditional joint classifications may not reliably indicate functional mobility across vertebrate diversity.
  • Understanding form-function relationships in skeletal joints requires considering complex interactions and translational movements.