![]() Additionally, notice how these muscles work when you are speaking. The next time you eat some food, notice how the buccinator muscles in your cheeks and the orbicularis oris muscle in your lips contract, helping you keep the food from falling out of your mouth. Between the skin and mucous membranes are connective tissue and buccinator muscles. This membrane is made up of non-keratinized, stratified squamous epithelium. While their outer covering is skin, their inner covering is mucous membrane. The cheeks make up the oral cavity’s sidewalls. The labial frenulum is a midline fold of mucous membrane that attaches the inner surface of each lip to the gingiva (gum). Lips are very vascular with a thin layer of keratin hence, the reason they are "red." They have a huge representation on the cerebral cortex, which probably explains the human fascination with kissing! The lips cover the orbicularis oris muscle, which regulates what comes in and goes out of the mouth. Their outer covering is skin, which transitions to a mucous membrane in the mouth proper. The image also shows the upper and lower lips attached by the upper and lower labial frenula (singular: frenulum).Īt the entrance to the mouth are the lips, or labia(singular = labium). Below the tongue are openings of the ducts of submandibular glands. The floor of the mouth has the different types of teeth labeled, tongue, and lingual frenulum attached to the tongue. Teeth, hard and soft palate, fauces, arches, and uvula form the roof of the mouth. The structures of the mouth are illustrated in Figure 21.4.1. The cheeks, tongue, and palate frame the mouth, which is also called the oral cavity (or buccal cavity).
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