An auricle, also known as the auricula or pinna, is an anatomical structure found in animals, including humans, that forms the visible part of the outer ear. It is a prominent, external, fleshy appendage composed of elastic cartilage covered with skin. The function of the auricle is to collect and direct sound waves into the ear canal, allowing for hearing.
In humans, the auricle consists of various ridges, folds, and depressions, which give it its distinct shape. It is composed of two parts: the helix, a prominent ridge which curves around the upper part of the auricle, and the antihelix, an inner curved ridge. These structures help to increase the surface area of the auricle and aid in directing sound.
The auricle is comprised of three layers: the outer layer, consisting of cartilage covered by skin, the intermediate layer, which is primarily adipose tissue, and the inner layer, which consists of many blood vessels.
Furthermore, the auricle is also essential in assisting with sound localization, allowing individuals to determine the direction from which sounds are coming. It aids in the perception of slight cues in the timing and intensity of sound.
Overall, the auricle serves as a crucial component of the auditory system, helping to capture and direct sound waves into the ear canal for hearing and localization.
