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Tissues

Tissues

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.

Tissues

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Tissues are a group of cells that share a common embryonic origin. Microscopic observation reveals that the cells in a tissue share morphological features and are arranged in an orderly pattern to perform specific functions. From an evolutionary perspective, tissues appear in more complex organisms. Although there are many types of cells in the human body, they are organized into four broad categories of tissues: epithelial, connective, muscle, and nervous. Each of these categories is...

Plant Cells and Tissues

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Tissue Membranes

Tissue Membranes

A tissue membrane is a thin layer of cells that covers the outside of the body, the organs, internal passageways that lead to the exterior of the body, and the lining of the moveable joint cavities. There are two basic types of tissue membranes— connective tissue and epithelial membranes.
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Related Experiment Video

Updated: Feb 7, 2026

Optical Clearing of Plant Tissues for Fluorescence Imaging

Optical Clearing of Plant Tissues for Fluorescence Imaging

Published on: January 5, 2022

Clearing for Deep Tissue Imaging.

Michael Muntifering¹, Daniel Castranova², Gregory A Gibson³

¹Division of Developmental Biology, Cincinnati Children's Research Foundation, Cincinnati, Ohio.

Current Protocols in Cytometry

|July 14, 2018

Summary

This summary is machine-generated.

Tissue clearing techniques make opaque biological tissues transparent for 3D imaging. This enables researchers to study whole organs and organisms without sectioning, revealing cellular structures and interactions in their natural context.

Keywords:

CLARITY clear see deep brain (SeeDB)three-dimensional imaging of solvent-cleared organs (3DISCO)tissue clearing unobstructed brain/body imaging cocktails (CUBIC)

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Last Updated: Feb 7, 2026

Optical Clearing of Plant Tissues for Fluorescence Imaging

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Published on: May 10, 2022

Area of Science:

Biological imaging
Biotechnology
Microscopy

Background:

Biological tissues scatter and absorb light, limiting optical microscopy to thin sections.
Imaging whole tissues requires extensive sectioning and reconstruction, hindering 3D analysis.
Current methods restrict the depth and clarity of light penetration in biological samples.

Purpose of the Study:

To introduce tissue clearing as a method to overcome light scattering and absorption.
To enable 3D imaging of whole tissues and organisms without sectioning.
To present four popular tissue clearing protocols for diverse biological applications.

Main Methods:

Tissue clearing protocols were applied to biological samples.
Key protocols discussed include CUBIC, CLARITY, 3DISCO, and SeeDB.
Methods focus on removing light-scattering/absorbing components and refractive index matching.

Main Results:

Tissue clearing significantly enhances light penetration and imaging depth.
Cleared tissues allow for interrogation of entire organs and organisms in 3D.
Researchers can study biological processes and cell interactions within their native 3D environment.

Conclusions:

Tissue clearing revolutionizes biological imaging by enabling visualization of intact tissues.
The described protocols (CUBIC, CLARITY, 3DISCO, SeeDB) offer versatile solutions for various research needs.
This technique facilitates deeper understanding of biological structures and functions in a 3D context.