![]() 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 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 structures of the mouth are illustrated in Figure 23.7.Īt the entrance to the mouth are the lips, or labia (singular = labium). The cheeks, tongue, and palate frame the mouth, which is also called the oral cavity (or buccal cavity). In this section, you will examine the anatomy and functions of the three main organs of the upper alimentary canal-the mouth, pharynx, and esophagus-as well as three associated accessory organs-the tongue, salivary glands, and teeth. Trace the pathway food follows from ingestion into the mouth through release into the stomach.Describe the process of swallowing, including the roles of the tongue, upper esophageal sphincter, and epiglottis.Group the 32 adult teeth according to name, location, and function.Describe the structures of the mouth, including its three accessory digestive organs.By the end of this section, you will be able to:
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