What is the medical term meaning instrument used to visually examine interior of a body cavity or organ?

The medical term meaning instrument used to visually examine the interior of a body cavity or organ is endoscope. An endoscope is a long, thin, flexible tube with a camera and a light on the end. It is inserted into the body through a natural opening, such as the mouth, nose, or rectum, or through a small incision. Endoscopes are used to diagnose and treat a variety of medical conditions, such as gastrointestinal bleeding, ulcers, and tumors.