The semicircular canals are a part of the inner ear that are responsible for detecting rotational movements of the head. Although there are no exact synonyms for "semicircular canals," there are a few ways to refer to this area of the ear in simpler terms. For example, the semicircular canals are sometimes referred to as the "circular canals," as they are shaped like a half-circle. Other times, they may be referred to as the "vestibular canals," as they play a key role in the vestibular system of the body. Ultimately, regardless of the term used, the semicircular canals are an essential component of our sense of balance and spatial orientation.