Pharynx: The hollow tube that is about 5 inches long and starts behind the nose and ends at the top of the trachea (windpipe) and esophagus. The pharynx serves as a vestibule or entryway for the trachea and esophagus. From Healthy Resources How IL Inhibitors Work to Treat PsoriasisModerate to Severe UC: Targeted SolutionsExpert Insight on a New Treatment for C3G Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew