The exterior of the lips is formed by a layer of skin and the interior by a layer of mucous membrane. Between these two layers is the main muscle for the lips known as Orbicularis oris and blood vessels meant for the lips, some nerves,areolar tissue, fat.
from Health-and-Fitness Articles from EzineArticles.com http://ift.tt/1DlBjCd
from Health-and-Fitness Articles from EzineArticles.com http://ift.tt/1DlBjCd
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