What is the name of the instrument used to examine the inside of the urinary bladder?

The instrument specifically designed for examining the inside of the urinary bladder is called a cystoscope. This tool is equipped with a light and camera that allow healthcare providers to view the interior lining of the bladder as well as the urethra. The cystoscope can be used for both diagnostic purposes, such as identifying abnormalities, and therapeutic procedures, including the removal of small tumors or stones.

Other instruments listed serve different purposes. An endoscope is a general term for a flexible tube with a light that can be used for visual examinations of various internal organs, but it is not specific to the urinary bladder. A colonoscope is used to examine the colon and rectum, and an otoscope is designed for viewing the ear canal and eardrum. Thus, the cystoscope is the correct choice for bladder examination.