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Related Concept Videos

Classification of Epithelial Tissues: Overview01:22

Classification of Epithelial Tissues: Overview

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Epithelial tissues are classified according to the shape of the cells and the number of cell layers formed. Cell shapes can be squamous (flattened and thin), cuboidal (square-like, as wide as it is tall), or columnar (rectangular, taller than it is wide). Additionally, the nucleus shape helps identify the type of epithelial cells. Squamous cells have flattened disc-shaped nuclei, cuboidal cells have spherical nuclei, and columnar cells have elongated nuclei.
Based on the number of cell layers,...
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Classification of Epithelial Tissues: Simple Epithelium01:30

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Simple epithelium consists of a single layer of cells that lines body cavities and blood vessels. The shape of the cells in the epithelium reflects the function of the tissue. Cells in simple squamous epithelium appear as thin scales with flat, elliptical nuclei that mirror the form of the cell.
Because of the thinness of the cells, simple squamous epithelium is present where the rapid passage of chemical compounds is observed. For example, the endothelium that lines the capillaries and vessels...
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Classification of Epithelial Tissues: Glandular Epithelium01:20

Classification of Epithelial Tissues: Glandular Epithelium

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The glandular epithelium is made of one or more epithelial cells modified to synthesize and secrete chemical substances. Glandular epithelia can be classified based on cell number. Unicellular glands have individual secretory cells scattered across the epithelial monolayer. In contrast, multicellular glands consist of a hollow tubular duct attached to the cluster of secretory cells located in the deep pockets.
Multicellular glands are formed during early development when epithelial budding...
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Cell Diversity01:13

Cell Diversity

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The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
Multicellular...
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Classification of Epithelial Tissues: Stratified Epithelium01:29

Classification of Epithelial Tissues: Stratified Epithelium

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Stratified epithelium consists of several stacked layers of cells. They provide the durability to withstand constant physical and chemical attacks. Stratified epithelium is named after the shape of the most apical layer of cells. Stratified squamous epithelium is the most common type found in the human body. In this tissue, the apical cells are squamous, whereas the basal layer contains either columnar or cuboidal cells. The basal cells divide to form new daughter cells, which gradually become...
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Time-lapse Imaging of Primary Preneoplastic Mammary Epithelial Cells Derived from Genetically Engineered Mouse Models of Breast Cancer
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Defining breast epithelial cell types in the single-cell era.

G Kenneth Gray1, Eric G Carlson2, Tatyana Lev3

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA, USA; Ludwig Center at Harvard, Boston, MA, USA; Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA.

Developmental Cell
|September 9, 2025
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Summary
This summary is machine-generated.

Single-cell studies reveal breast epithelial diversity, causing confusion in cell type identification. This perspective proposes a consensus model for breast cell types to guide future research and atlas development.

Keywords:
breasthierarchical differentiationhuman biologylactationmammary glandnomenclaturesingle-cell biologytissue organization

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Area of Science:

  • Cell Biology
  • Genomics
  • Tissue Engineering

Background:

  • Single-cell studies have revealed significant heterogeneity within breast epithelial tissues.
  • This heterogeneity has led to a lack of consensus regarding distinct breast cell types and their classifications.
  • Advancing comprehensive breast atlas projects is challenged by this terminological ambiguity.

Purpose of the Study:

  • To establish a consensus on the identities, properties, and nomenclature of breast epithelial cell types.
  • To propose a standardized model for breast cell classification.
  • To outline future goals for breast atlas initiatives.

Main Methods:

  • This study is a perspective piece, synthesizing current knowledge from single-cell research.
  • It involves critical analysis of existing data and literature on breast epithelial cells.
  • The authors propose a consensus framework based on their collective expertise.

Main Results:

  • A proposed consensus model for breast epithelial cell types, including their defining characteristics.
  • Recommendations for standardized naming conventions to ensure clarity and consistency.
  • Identification of key areas for future research to refine cell type definitions.

Conclusions:

  • A unified model for breast cell types is crucial for advancing breast atlas efforts.
  • Adoption of proposed nomenclature and classification will facilitate collaborative research.
  • This work provides a foundation for future investigations into breast tissue complexity.