The |lips| are a pair of muscular tissues which form the entryway of the oral cavity. They are arranged laterally, at the top and bottom of the |mouth| opening, but since they are manipulated by a versatile sphincter muscle, the |lips| are able to take a wide variety of arrangements. They serve primarily to help in speech articulation and to manipulate and control food within the |mouth| cavity. The affectionate kiss is also facilitated by the versatility of the |lips|.
