What is the outer rim of the pinna known as?

The outer rim of the pinna is known as the helix. This structure is a prominent feature of the external ear, providing the pinna with its characteristic shape. The helix curves around the top and sides of the ear, helping to direct sound waves into the ear canal. Understanding the anatomy of the ear is crucial for hearing instrument specialists, as it allows for better selection and fitting of hearing devices, tailored to the unique ear shapes and structures of their clients. The other options represent different parts of the pinna; for instance, the antihelix is a ridge located just inside the helix, while the lobe refers to the fleshy, lower part of the ear. The concha is the bowl-shaped part of the outer ear that helps funnel sounds into the ear canal.