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Related Concept Videos

Epithelial Tissues and Their Functions01:23

Epithelial Tissues and Their Functions

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Epithelial tissues are large sheets of cells covering all of the surfaces of the body. These surfaces can be internal or external, for example, skin, airways, the digestive tract, the urinary system, and the reproductive system. Hollow organs and body cavities that do not connect to the body's exterior, including blood vessels and serous membranes, are lined by epithelial tissue known as the endothelium.
Epithelial tissues provide the body's first line of protection from physical,...
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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: 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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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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Classification of Epithelial Tissues: Simple Epithelium01:30

Classification of Epithelial Tissues: Simple Epithelium

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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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Tissues01:18

Tissues

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Cells with similar structure and function are grouped into tissues. A group of tissues with a specialized function is called an organ. There are four main types of tissue in vertebrates: epithelial, connective, muscle, and nervous.
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Related Experiment Video

Updated: Feb 12, 2026

Author Spotlight: Unraveling the Molecular Mechanisms in PCO and Fibrosis Following Cataract Surgery
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Author Spotlight: Unraveling the Molecular Mechanisms in PCO and Fibrosis Following Cataract Surgery

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Epithelial Keratitis After Cataract Surgery.

Yang K Cho1, Jin W Kwon1, Sneha Konda2

  • 1Department of Ophthalmology, St. Vincent's Hospital College of Medicine, The Catholic University of Korea, Paldal-Gu, Suwon, Gyeonggi-Do, Korea.

Cornea
|March 30, 2018
PubMed
Summary
This summary is machine-generated.

Epithelial keratitis after cataract surgery is uncommon. Herpes simplex keratitis (HSK) can be misdiagnosed, with temporal incisions potentially triggering HSK reactivation.

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Establishment of a Clinically Relevant Ex Vivo Mock Cataract Surgery Model for Investigating Epithelial Wound Repair in a Native Microenvironment
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Area of Science:

  • Ophthalmology
  • Surgical Complications
  • Infectious Eye Diseases

Background:

  • Cataract surgery is a common procedure with a low risk of complications.
  • Epithelial keratitis is a potential postoperative complication that can affect vision.
  • Understanding the causes and risk factors is crucial for prevention and management.

Purpose of the Study:

  • To determine the incidence of epithelial keratitis post-cataract surgery.
  • To identify perioperative factors, clinical characteristics, and etiologies.
  • To investigate the link between surgical approach and keratitis development.

Main Methods:

  • Retrospective chart review of 666 patients undergoing cataract surgery.
  • Evaluation of postoperative epithelial keratitis incidence and related factors.
  • Utilized polymerase chain reaction (PCR) and clinical diagnosis for herpes simplex keratitis (HSK).

Main Results:

  • Fifteen eyes (2.25%) developed postoperative epithelial keratitis.
  • Herpes simplex keratitis (HSK) was diagnosed in 11 of these 15 eyes, often initially misdiagnosed as toxic keratitis.
  • Temporal corneal incision location was significantly associated with HSK occurrence (P < 0.05).

Conclusions:

  • HSK epithelial keratitis is a rare but significant complication following cataract surgery.
  • Early misdiagnosis is possible due to the rarity of HSK.
  • Temporal corneal incisions may trigger HSK reactivation by interrupting corneal nerves.