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Related Concept Videos

Introduction to Joints00:58

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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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The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...
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Bones of the Lower Limb: Femur and Patella01:16

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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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Hydraulic Jump: Problem Solving01:16

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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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Design Example: Frog Muscle Response01:14

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A student is tasked to work on an intriguing experiment involving an RL (Resistor-Inductor) circuit to study the muscle response of a frog's leg to electrical stimulation. The RL circuit plays a crucial role in this experiment, providing the means to control and measure the electrical impulses that trigger muscle contraction.
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Bone Formation by Intramembranous Ossification01:29

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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.
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Related Experiment Video

Updated: Mar 1, 2026

Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats
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Form-function relationships determining optimal jumping performance in an early bipedal dinosaur.

James P Charles1, Delyle T Polet2, John R Hutchinson2

  • 1Musculoskeletal and Ageing Science, University of Liverpool, Liverpool, UK.

Journal of the Royal Society, Interface
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Optimal control simulations reveal that the dinosaur Coelophysis bauri and the bird Eudromia elegans had similar vertical jumping abilities due to geometrically similar hindlimbs, despite differences in body shape and size.

Keywords:
muscle workmusculoskeletal modelpredictive simulationtail

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Area of Science:

  • Paleontology
  • Biomechanics
  • Evolutionary Biology

Background:

  • Understanding extinct animal locomotion is key to evolutionary insights.
  • Bipedal archosaurs exhibit diverse morphologies and movement capabilities.

Purpose of the Study:

  • To predict and compare the vertical jumping performance of Coelophysis bauri and Eudromia elegans.
  • To investigate the influence of morphology and joint dynamics on jumping ability in bipedal archosaurs.

Main Methods:

  • Optimal control simulations were employed to predict vertical jumping performance.
  • Hindlimb geometry and tail joint dynamics were analyzed for Coelophysis bauri.

Main Results:

  • Coelophysis bauri and Eudromia elegans showed similar predicted jumping performances, linked to hindlimb geometry.
  • Jumping performance in Coelophysis was highly sensitive to tail joint range of motion and tail mass.

Conclusions:

  • Body size, morphology, and joint dynamics significantly impacted jumping ability in bipedal archosaurs.
  • Tail morphology and joint mobility influenced jumping performance, offering insights into archosaur evolution.