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Last Updated: Jun 25, 2015

The lips are highly mobile structures that surround the mouth opening. They contain skeletal muscles and a variety of sensory nerves that are useful in judging the temperature and texture of foods. Their normal reddish color is due to an abundance of blood vessels near their surfaces. The external borders of the lips mark the boundaries between the skin of the face and the mucous membrane that linesmycontentbreak the alimentary canal.