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Related Concept Videos

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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Muscle Coordination and Action01:24

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Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement....
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Muscles that Move the Leg01:23

Muscles that Move the Leg

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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
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The quadriceps femoris, the most visible muscle of the anterior compartment, is integral for leg extension and thigh flexion. It is formed by merging four distinct muscles — the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris. The quadriceps tendon, a shared tendon of the four quadriceps muscles, is affixed...
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Movement Joints in Buildings01:27

Movement Joints in Buildings

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Movement joints in buildings are essential design elements that accommodate inevitable motions caused by various factors such as temperature changes, moisture content variations, and structural deflections. These motions, if not considered in design and construction, can lead to unsightly or dangerous damage. Movement joints are incorporated in different forms to manage these stresses and allow materials to move without causing distress.
The simplest type of movement joints, working joints, are...
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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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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.
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Related Experiment Video

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Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum
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Limb coordination: Coming together to bounce along.

Scott L Hooper1

  • 1Department of Biological Sciences, Ohio University, Athens, OH 45701, USA.

Current Biology : CB
|June 18, 2024
PubMed
Summary

Sea stars can switch from crawling to bouncing without a central brain. This movement emerges from local coordination of their tube feet, demonstrating a decentralized control system in locomotion.

Area of Science:

  • Marine biology
  • Biophysics
  • Robotics

Background:

  • Sea stars exhibit diverse locomotion gaits, including crawling and bouncing.
  • Understanding the neural control mechanisms underlying complex animal movements is a key challenge.

Purpose of the Study:

  • To investigate the control mechanisms enabling sea stars to transition between crawling and bouncing gaits.
  • To determine if centralized neural control is necessary for the synchronization of tube feet during bouncing.

Main Methods:

  • Experimental observations of sea star locomotion.
  • Computational modeling of sea star movement dynamics.
  • Robotic simulations replicating sea star biomechanics.

Main Results:

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Related Experiment Videos

Last Updated: Jun 23, 2025

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Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum

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3D Kinematic Gait Analysis for Preclinical Studies in Rodents
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  • Sea star locomotion transition from crawling to bouncing does not rely on centralized neural input.
  • Synchronization of tube feet during bouncing arises from local interactions.
  • Decentralized control mechanisms can generate complex, coordinated movements.

Conclusions:

  • Complex locomotion in sea stars can be achieved through local control mechanisms.
  • The findings challenge traditional models of motor control requiring central command.
  • This research offers insights into decentralized systems applicable to robotics and biology.