The stratum corneum is superficial to the stratum basale. The stratum basale is deep to the stratum corneum.
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"Stratum" is the singular.
If you have a stratum and I have another stratum, then together we have two strata .
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the stratum basale aka germinitivium is the stratum that has
miotic division of cells and there is some cell production in the
stratum spinosum as well
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The singular form of "stratum" is "stratum." The word does not change in its singular form.