Definition: The term "ulnoradial" is a medical term that refers to the inner ear, which is responsible for hearing and balance. It consists of three main parts: 1. The cochlea - This is a hollow organ located in the inner ear that contains the hair cells of the ear. 2. The vestibular organs - These are two small bones on the side of the head that help to sense movement in one's head, especially when moving in circles or turning. 3. The auditory