What are the two main parts of the outer ear?

The correct choice identifies the two main components of the outer ear, which are the pinna and the external auditory canal. The pinna, also known as the auricle, is the visible part of the ear that is located on the outside of the head. Its unique shape helps to capture and funnel sound waves into the ear canal.

The external auditory canal is a tubular structure that extends from the pinna to the eardrum. It serves to transmit sound waves from the outer ear to the middle ear. The canal also plays a crucial role in protecting the inner components of the ear from dirt and foreign particles.

Understanding the structure and function of the outer ear components is essential for hearing specialists, as it forms the first part of the auditory system and is integral to sound acquisition. The other options listed refer to parts and functions of the middle and inner ear or specific cellular structures that are not classified as parts of the outer ear, making them irrelevant in this context.