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Figure1.- Thyroid gland of a human infant

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Figure1.- Thyroid gland of a human infant

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The objective lens is 400x.

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- It is located in ducts of glands that perform absorption and secretion.
- Covers the lens of the eyes, controling the fluids that get into and out from the surrounding eye fluid
- Covers the ovary, plays an important role in the development and release of the egg
- Plays an important role in the development of sperms.
- In the Kidneys helps in the formation of urine.

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STRUCTURE:
It consists brick shaped cells with the nucleus in the centre. A microvilli could be presented in the apical surface as in the case of small intestine.

LOCATION:
The columnar epithelial tissue can be found in the organs where secretion and absorption are important as in some glands or in most of the digestive tract such as in the small intestine where the secretion of digestive juices takes place as the assimilation of nutrients

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- Covering the lens of the eye
- Germinal epithelium of
ovaries
- Kidney tubules
- Ducts of salivary glands
- Ducts of sweat glands
- Bile duct
- Follicles of thyroid gland
- Pancreas
- Liver
- Mammary glands
- Lining of bronchioles

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It is made of one layer of cells (for this reason 'simple').

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Multiple layers of cuboidal cells.

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STRUCTURE: It consists of a single layer of varied cells in height and in nuclei position.
Cilia appears in the apical surface of these cells and its main function is to form a mucous membrane to protect lines for entrance of undesirable components.

LOCATION: This type of tissue can be found in the upper respiratory tract such as trachea where the materials that are not part of the body can be secreted by cough or sneeze.

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Cells of cuboidal epithelium have the shape of a dice and  are joined to form a sheet. It can be stratified or simple.

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The objective lens is 630x

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Animal tissue that lines the surface of the body and  covers internal organs  and cavities.

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The objective lens is 400x

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It is also found in the kidney specifically in the Bowman's capsule which allows for an easier and faster filtration of the blood.

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This type of epithelium are one cell thick as opposed to stratified squamous squamous epithelium. These consist of single layer of flattened cells resting on connective tissues.

Simple squamous line the surface of arteries and veins mostly referred to as the endothelium and it also lines capillaries and the alveoli for gaseous exchange.

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The word squamous is used to describe the appearance of the cell which is scale-like. Stratified squamous epithelium consists of multiple cells which are stacked in layers whose membrane is selectively permeable and provides protection against friction and microbial invasion(e.g. bacteria) and desiccation(i.e. deprived of moisture).

Stratified squamous epithelium contain columnar cuboidal cells which gradually flatten towards the surface.

This type of epithelium exist in two forms:
1. Keratinized stratified epithelium- found in outer dry surfaces of body such as the skin and nails.

2. Non-keratinized stratified epithelium- found on moist surface that will likely go through wear and tear, such as the mouth cavity, tongue, pharnyx and esophagus.

Here is a diagram showing the layers of stratified squamous epithelium.