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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

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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:
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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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Cells of the Epidermis01:24

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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.
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Papillary Dermis01:11

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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.
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Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
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Cellular Differentiation00:57

Cellular Differentiation

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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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Related Experiment Video

Updated: Dec 27, 2025

Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale
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Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale

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Epidermal structure and differentiation.

Rebecca S Moreci1, Terry Lechler1

  • 1Departments of Dermatology and Cell Biology, Duke University Medical Center, Durham, NC 27710, USA.

Current Biology : CB
|February 26, 2020
PubMed
Summary
This summary is machine-generated.

This study tracks epidermal cells from creation to death, revealing this life cycle is essential for skin health and function. Understanding epidermal cell dynamics is key to skin biology.

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Last Updated: Dec 27, 2025

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Area of Science:

  • Cell Biology
  • Dermatology
  • Tissue Homeostasis

Background:

  • Epidermal cells form the skin's protective barrier.
  • Cellular life cycles are fundamental to tissue maintenance and repair.
  • Dysregulation of epidermal cell turnover is implicated in various skin diseases.

Purpose of the Study:

  • To provide a comprehensive overview of the epidermal cell life cycle.
  • To elucidate the critical roles of epidermal cell birth, differentiation, and death in maintaining skin function.
  • To highlight the necessity of the complete epidermal cell journey for overall epidermal health.

Main Methods:

  • Review of existing literature and research on epidermal cell biology.
  • Integration of findings from developmental biology, cell biology, and dermatology.
  • Conceptual framework illustrating the epidermal cell lifespan.

Main Results:

  • The complete life cycle of an epidermal cell, from proliferation to terminal differentiation and eventual shedding or apoptosis, is essential for epidermal homeostasis.
  • Each stage of the epidermal cell's journey contributes uniquely to barrier integrity, immune surveillance, and wound healing.
  • Disruptions at any point in this process can compromise skin function and lead to pathology.

Conclusions:

  • The dynamic life cycle of epidermal cells is a tightly regulated process crucial for skin barrier function and health.
  • Understanding the intricate details of epidermal cell turnover offers insights into potential therapeutic strategies for skin disorders.
  • This Primer emphasizes the importance of viewing epidermal cells not as static units but as dynamic entities with a vital lifespan.