Mouth (An Overview) The function of the mouth and its associated structures is to form a receptacle for food, to begin mechanical digestion through chewing (mastication), to swallow food, and to form words in speech. It can also assist the respiratory system in the passage of air. Omentum The omentum is an apronlike double fold of fatty membrane that hangs down in front of the intestines. It contains blood vessels, nerves, lymph vessels and lymph nodes. It acts as a storage for fat and also may limit the spread of infection in the abdominal cavity. Trachea The trachea begins immediately below the larynx (voicebox) and runs down the center of the front part of the neck ends behind the upper part of the sternum. Here it divides to form two branches which enter the lung cavities. The trachea (windpipe) forms the trunk of an upside-down tree and is flexible, like a vacuum tube, so that the head and neck may twist and bend during the process of breathing. The trachea, or windpipe, is made up of fibrous and elastic
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