The stirrup is the smallest bone in the human body. It is located inside the ear and it part of the system that carries the signals to the brain. The stirrip is about 1/8th of an inch long and about the size of a grain of rice. This tiny bone is connected to a couple other tiny bones called the anvil and hammer and a membrane called the oval window. The stirrup bone, anvil bone, and hammer bone are connected to the eardrum. Inside the eardrum sound is collected and sent to the brain in the form of nerve signals.
The ear if important for balance and agility. Without the ear a person would not be able to stand without falling down.