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Epidermis

Definition

noun

One or more layers of cells forming the outermost portion of the skin or integument


Supplement

The epidermis is a protective outer covering of many plants and animals. It may be comprised of a single layer, as in plants, or of several layers of cells on top of the dermis, as in those of vertebrate animals. The primary role of the epidermis is to protect the more susceptible layers of the skin.

In plants, the epidermal cells secrete further protective substance (called cuticle) to prevent desiccation (water loss). A plant leaf is lined with two layers of epidermis (i.e. upper and lower): one on top of and another one below the mesophyll layer.

In animals, such as vertebrates, the epidermis is made up of several layers to protect the underneath layers from physical damage, infection, and water loss. In humans, for instance, the epidermis is made of layers such as the following:


Word origin: epi- (on top of) + derma (skin)

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What is Epidermis,Hypodermis and endodermis of plants?

It is known that outer covering of stem,leaves,roots is Epidermis. Then what is hypodermis and endodermis? Where do we find these tissues in plants?

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by kumar985
Fri Jun 28, 2013 3:47 pm
 
Forum: Botany Discussion
Topic: What is Epidermis,Hypodermis and endodermis of plants?
Replies: 1
Views: 1357

Re: Molecules entering the bloodstream from skin absorption

... as a way to dispense medicine. And it talks about the sweat glands being a one of the main structures medicine would use to pass through the epidermis. So maybe this is why the feet might be a good area for the application of essential oils? Maybe through trial and error it just so happens ...

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by maymayrays
Fri Dec 07, 2012 4:24 am
 
Forum: Human Biology
Topic: Molecules entering the bloodstream from skin absorption
Replies: 2
Views: 13517

Monocot leaf cross section

Hi! I'm new here. :) There's a question I need solved: Can one tell which side is the upper epidermis from the cross section of a monocot leaf, like this one? http://www.lima.ohio-state.edu/biology/images/zealeaf2.jpg Since monocot leaves don't have ...

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by johntdlemon
Tue Nov 13, 2012 2:46 am
 
Forum: Botany Discussion
Topic: Monocot leaf cross section
Replies: 1
Views: 2694

Re: narrowed down 1 of my unknowns help with other...

yes that is what she said that is was S. epidermis...

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by chrissy0022
Sat Apr 28, 2012 2:46 am
 
Forum: Microbiology
Topic: narrowed down 1 of my unknowns help with other...
Replies: 11
Views: 3645

Re: narrowed down 1 of my unknowns help with other...

My second Unknown should have been S. Epidermis but I had a negative result on My VP Test....leading me to conclude that it was M. Luteus... and ideas why that would happen?

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by chrissy0022
Thu Apr 26, 2012 4:43 am
 
Forum: Microbiology
Topic: narrowed down 1 of my unknowns help with other...
Replies: 11
Views: 3645
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