Editing Epidermis (section)

===Cellular components===
The epidermis primarily consists of [[keratinocytes]]<ref name="Rooks" /> ([[cell proliferation|proliferating]] basal and [[cell differentiation|differentiated]] suprabasal), which comprise 90% of its cells, but also contains [[melanocyte]]s, [[Langerhans cell]]s, [[Merkel cell]]s,<ref name="Andrews"/>{{rp|2–3}} and inflammatory cells. Epidermal thickenings called [[Rete pegs|Rete ridges]] (or rete pegs) extend downward between [[dermal papillae]].<ref>[http://medical-dictionary.thefreedictionary.com/rete+ridge TheFreeDictionary &gt; rete ridge] Citing: The American Heritage Medical Dictionary Copyright 2007, 2004</ref> [[Blood]] [[capillaries]] are found beneath the epidermis, and are linked to an [[arteriole]] and a [[venule]].
The epidermis itself has no [[circulatory system|blood supply]] and is nourished almost exclusively by diffused oxygen from the surrounding air.<ref name=stucker>{{cite journal | vauthors = Stücker M, Struk A, Altmeyer P, Herde M, Baumgärtl H, Lübbers DW | title = The cutaneous uptake of atmospheric oxygen contributes significantly to the oxygen supply of human dermis and epidermis | journal = The Journal of Physiology | volume = 538 | issue = Pt 3 | pages = 985–994 | date = February 2002 | pmid = 11826181 | pmc = 2290093 | doi = 10.1113/jphysiol.2001.013067 }}</ref> Cellular mechanisms for regulating [[water]] and [[sodium]] levels ([[Epithelial sodium channel|ENaC]]s) are found in all layers of the epidermis.<ref name="2017-Hanukoglu">{{cite journal | vauthors = Hanukoglu I, Boggula VR, Vaknine H, Sharma S, Kleyman T, Hanukoglu A | title = Expression of epithelial sodium channel (ENaC) and CFTR in the human epidermis and epidermal appendages | journal = Histochemistry and Cell Biology | volume = 147 | issue = 6 | pages = 733–748 | date = June 2017 | pmid = 28130590 | doi = 10.1007/s00418-016-1535-3 | s2cid = 8504408 | url = https://zenodo.org/record/890756 }}</ref>