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Related Concept Videos

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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
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After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
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Related Experiment Video

Updated: Apr 20, 2026

A Full Skin Defect Model to Evaluate Vascularization of Biomaterials In Vivo
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Integra® dermal regenerative template application on exposed tendon.

John Hulsen1, Ryan Diederich2, Michael W Neumeister2

  • 1Department of Plastic Surgery, The Ohio State University, 915 Olentagy River Road, Suite 2100, Columbus, OH 43212-3153 USA.

Hand (New York, N.Y.)
|November 22, 2014
PubMed
Summary

Integra® dermal regenerative template incorporation over exposed Achilles tendon begins at the periphery and progresses centrally. After four weeks, Integra® histologically resembles normal dermis, providing a vascularized bed for potential skin grafting.

Keywords:
Dermal regeneration templateIntegraTendon

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Area of Science:

  • Regenerative medicine
  • Tissue engineering
  • Wound healing

Background:

  • Exposed tendons without paratenon pose a reconstructive challenge.
  • Integra® dermal regenerative template aids in creating a vascularized bed for skin grafting.
  • Histological changes during Integra® incorporation onto avascular tendons are not well-described.

Purpose of the Study:

  • To characterize the histological changes during Integra® dermal regenerative template incorporation over avascular tendon.
  • To determine the pattern and origin of vascularization within Integra® on tendon.

Main Methods:

  • A full-thickness defect was created over rabbit Achilles tendons.
  • Integra® was applied to the exposed tendon.
  • Tissue specimens were collected at 1, 2, 3, and 4 weeks post-application for histological evaluation using hematoxylin and eosin staining.

Main Results:

  • At week 1, limited adherence and peripheral myofibroblast infiltration were observed.
  • By week 2, increasing vascularity at the dermis-Integra junction and central cellularity emerged.
  • Integra® was fully revascularized by week 3 and exhibited normal dermal histology by week 4.

Conclusions:

  • Neovascularization of Integra® over exposed tendon initiates from peripheral tissues.
  • Vascular ingrowth progresses from the dermis-Integra interface towards the tendon center.
  • Integra® demonstrates histological characteristics of native dermis within four weeks, indicating successful incorporation.