Inner ear Is the ancient part of the ear ... longer than that of reptiles. In mammals, a cartilaginous pinna is usually present about the external opening to amplify and channel sound waves. Evolution ...

and the inner ear (see graphic). The outer ear consists of a pinna and an external auditory canal and is responsible for funnelling sound waves into the ear. The middle ear has an eardrum and ...

The ear can detect a time difference as slight as 30 microseconds ... The first chart (left) shows the delays (in microseconds) caused by reflections from the inner pinna ridge which determine ...