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Related Concept Videos

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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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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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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Knee Joint01:23

Knee Joint

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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
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Method of Joints01:30

Method of Joints

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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint.
Since plane truss members are in the same plane, each joint is subjected to a coplanar and concurrent force system. To apply the method of joints, the first step is to...
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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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Related Experiment Video

Updated: Mar 23, 2026

A Friction Testing-Bioreactor Device for Study of Synovial Joint Biomechanics, Mechanobiology, and Physical Regulation
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A Friction Testing-Bioreactor Device for Study of Synovial Joint Biomechanics, Mechanobiology, and Physical Regulation

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Pointing out mechanisms underlying joint action.

Emanuele Porcu1, Luke Bölling2, Markus Lappe2

  • 1Institute for Psychology, University of Muenster, Fliednerstrasse 21, 48149, Muenster, Germany. porcu@uni-muenster.de.

Attention, Perception & Psychophysics
|March 27, 2016
PubMed
Summary
This summary is machine-generated.

This study reveals how spatial attention influences the Simon task. By manipulating attention, researchers found it affects both individual and joint Simon tasks, impacting response times.

Keywords:
AttentionJoint Simon taskJoint action

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Attention Studies

Background:

  • Spatial and feature-based attention are known to influence spatial compatibility effects in Simon tasks.
  • Limited research has explored how attention specifically modulates these effects, particularly in joint task scenarios.

Purpose of the Study:

  • To investigate if manipulating the attentional demands in a joint Simon task can alter spatial compatibility effects.
  • To determine if such manipulation can elicit a compatibility effect in an individual go-no-go Simon task.

Main Methods:

  • Participants performed a joint Simon task with a manipulated pointing response bias to direct spatial attention.
  • Reaction times were recorded at gesture onset to analyze compatibility effects.

Main Results:

  • A compatibility effect pattern was observed in the individual Simon task condition.
  • The joint Simon task condition showed an additional modulation of the compatibility effect.

Conclusions:

  • Spatial attention, inherent in action planning, significantly impacts performance in both individual and joint Simon tasks.
  • The findings highlight the role of action-oriented attention in modulating spatial compatibility effects.