Human ear

The ear is the organ that detects sound . It not only receives sound,but also aids in balance and body position. The ear is part of the auditory system .
The word "ear" may be used correctly to describe the entire organ or just the visible portion. In most mammals, the visible ear is a flap of tissue that is also calledthe pinna and is the first of many steps in hearing . In humans, the pinna is often called the auricle . Vertebrates have a pair of ears, placed somewhat symmetrically on opposite sides of the head. This arrangement aids in the ability to localize sound sources.