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Related Concept Videos

Renewal of Skin Epidermal Stem Cells01:12

Renewal of Skin Epidermal Stem Cells

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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Layers of the Epidermis01:21

Layers of the Epidermis

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The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
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Introduction to the Integumentary System01:25

Introduction to the Integumentary System

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The integumentary system is the organ system that comprises the skin and its associated structures. It is the largest system in the human body and plays a crucial role in protecting and maintaining homeostasis. The integumentary system serves several functions including protection, regulation, sensation, and secretion.
The skin, which is the primary organ of the integumentary system, consists of three main layers: the epidermis, dermis, and hypodermis (subcutaneous tissue). The epidermis is the...
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Cells of the Epidermis01:24

Cells of the Epidermis

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The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
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Papillary Dermis01:11

Papillary Dermis

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Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
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Reticular Dermis01:15

Reticular Dermis

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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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Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
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Related Experiment Video

Updated: Oct 18, 2025

Author Spotlight: Enhancing Skin Model Diversity with Cost-Effective 3D Cellular Models
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Author Spotlight: Enhancing Skin Model Diversity with Cost-Effective 3D Cellular Models

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Building and Maintaining the Skin.

Ya-Chieh Hsu1, Elaine Fuchs2

  • 1Department of Stem Cell and Regenerative Biology, Harvard University and Harvard Stem Cell Institute, Cambridge, Massachusetts 02138, USA.

Cold Spring Harbor Perspectives in Biology
|October 5, 2021
PubMed
Summary
This summary is machine-generated.

Mammalian skin relies on three key stem cell populations for repair and regeneration. These skin stem cells interact with their microenvironment, responding to external signals to maintain tissue health.

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Area of Science:

  • Dermatology
  • Stem Cell Biology
  • Regenerative Medicine

Background:

  • The skin serves as a vital barrier, maintained by specialized stem cell populations.
  • Epidermal, hair follicle, and melanocyte stem cells are crucial for skin integrity and repair.
  • These stem cells exist within complex microenvironments, or niches, that support tissue homeostasis and regeneration.

Purpose of the Study:

  • To review the interactions of skin stem cells with their microenvironments.
  • To highlight how external signals influence skin stem cell behavior.
  • To explain how skin stem cells adapt to maintain fitness and respond to injury.

Main Methods:

  • Review of existing literature on skin stem cell biology.
  • Analysis of cellular interactions within skin niches.
  • Exploration of signaling pathways influencing stem cell function.

Main Results:

  • Skin stem cells (epidermal, hair follicle, melanocyte) possess significant regenerative potential.
  • Stem cell niches provide essential support for tissue maintenance and repair.
  • Skin stem cells can sense and respond to systemic and external cues.

Conclusions:

  • Diverse cellular interactions within skin niches are key to stem cell function.
  • Far-reaching signals modulate skin stem cell activity for optimal tissue response.
  • Understanding these interactions can inform strategies for skin regeneration and health.