Illustration of a human head and neck, cross-section in front of a blue-white background. Parts of the cranium and facial bones (white-yellow-ish) are visible, especially the mandibula and maxilla. The spine is shown with its disks (grey). The choana, as well as the oral cavity, trachea, and esophagus are red because of their mucosa. Muscles are hinted in the oral area. Cartilage and pharynx are blue. Food (bolus, yellow) should get from the oral cavity to the esophagus during deglutition, while the trachea is closed by the epiglottis. If this fails to happen, said person chokes.
