Pinna

Pinna (also known as the auricle or external ear) is the visible part of the ear that resides outside of the head. The word "pinna" is derived from the Latin word for "feather". In humans, the pinna is often referred to as the "ear", although it is just a part of the ear. It serves to collect and focus sound waves, funneling them into the ear canal.

Anatomy

The pinna consists of the helix (the outer rim), the antihelix (the inner rim), the concha (the hollow part), and the lobule (the lower, fleshy part). The pinna's anatomy is complex and intricate, allowing it to effectively collect and direct sound waves into the ear canal.

Function

The primary function of the pinna is to collect sound, and like a funnel, amplify it and direct it to the ear canal. With the help of the pinna, the ear can know the direction of the sound. Some animals, like the hare, have large, movable pinnae that allow them to detect predators or prey.

Clinical significance

Abnormalities or injuries to the pinna can lead to hearing problems. Some conditions, such as Microtia, Anotia, and Cauliflower ear, involve malformations or deformations of the pinna. Treatment for these conditions may involve surgery, and in some cases, a prosthetic ear.

See also

• Ear canal
• Microtia
• Anotia
• Cauliflower ear