What is the primary function of the outer ear?

The primary function of the outer ear is to collect sound waves. The outer ear consists of the visible part known as the pinna and the ear canal, which work together to gather sound waves from the environment. The shape of the pinna is crucial in directing these sound waves into the ear canal, where they can then travel to the eardrum and beyond. This collection process is vital for the perception of sound, as it helps funnel sounds toward the inner structures of the ear for further processing.

In relation to the other options, while transmitting sound waves to the brain is an essential part of hearing, it primarily occurs after the sound waves have been collected and processed by inner structures. Protecting the inner ear is a function of the ear's anatomy and certain biological mechanisms but is not the primary role of the outer ear. Amplification of sound occurs later in the auditory pathway, particularly in the middle ear, where the bones of the ear increase the sound intensity before it reaches the inner ear.