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Related Concept Videos

Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
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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.
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Related Experiment Video

Updated: Jul 27, 2025

Author Spotlight: Enhancing Grasping Abilities for Hemiplegic Patients with Flexible Robotic Limbs
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How might we build limbs

Rio Tsutsumi1,2, Mototsugu Eiraku1,2

  • 1Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.

Frontiers in Cell and Developmental Biology
|June 7, 2023
PubMed
Summary
This summary is machine-generated.

Scientists are exploring how to build limbs in vitro by understanding developmental biology. This research aims to create limb-like tissues from stem cells for regenerative medicine and drug testing.

Keywords:
limb developmentlimb organoidmorphogenesispluripotent stem cellsstem cell engineering

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Area of Science:

  • Developmental Biology
  • Regenerative Medicine
  • Stem Cell Engineering

Background:

  • Limb development is a complex process involving self-organization and external tissue interactions.
  • Current stem cell technologies can create limb-like tissues but not fully recapitulate morphogenesis.
  • Understanding limb developmental mechanisms is key to in vitro reconstruction.

Purpose of the Study:

  • To outline a method for building complete limbs in vitro.
  • To identify self-organized versus externally manipulated aspects of limb development.
  • To leverage developmental insights for advanced regenerative therapies.

Main Methods:

  • Analysis of limb developmental mechanisms, including modularity and tissue dependency.
  • Review of stem cell engineering for generating multicellular structures.
  • Postulation of in vitro culture conditions incorporating morphogen gradients and external tissues.

Main Results:

  • Limb development exhibits modularity, with axes established early and maintained.
  • External tissues like muscles, blood vessels, and nerves are crucial for limb formation.
  • Pluripotent stem cells can yield limb-like tissues, forming a basis for further development.

Conclusions:

  • In vitro limb morphogenesis requires understanding both intrinsic developmental programs and extrinsic tissue contributions.
  • Future research should focus on recreating morphogen gradients and incorporating essential external tissues in culture.
  • Successful in vitro limb development models could revolutionize drug screening for congenital limb defects and enable limb regeneration therapies.