Stratum spinosum

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What Wikipedia says

The stratum spinosum (or spinous layer/prickle cell layer) is a layer of the epidermis found between the stratum granulosum and stratum basale. This layer is composed of polyhedral keratinocytes. These are joined with desmosomes.

Excerpt from the Wikipedia article “Stratum spinosum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Modified from the original Grey's diagram here: http://en.wikipedia.org/wiki/Image:Gray941.png, Public domain, via Wikimedia Commons.