Antihelix

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Antihelix is an anatomical feature of the human ear, specifically part of the outer ear or pinna. The antihelix is a prominent Y-shaped fold of cartilage located just inside the rim of the ear, known as the helix. It plays a significant role in the structure and function of the ear, contributing to its ability to collect and direct sound waves into the ear canal. The antihelix surrounds the concha, the hollow next to the ear canal, and ends superiorly in two crura, or legs, that enclose a triangular depression known as the triangular fossa.

Anatomy and Function

The antihelix is situated parallel and just anterior to the helix, starting from the upper part of the lobule and ascending towards the concha. It is formed by fibrous cartilage, which gives the ear its shape and flexibility. The antihelix helps to enhance the ear's ability to capture sounds from the environment, directing them into the ear canal towards the tympanic membrane (eardrum), where sound is then transmitted to the middle and inner ear for processing.

The superior part of the antihelix divides into two crura: the superior and anterior crura. These crura form the boundaries of the triangular fossa, an important landmark in the anatomy of the outer ear. The shape and prominence of the antihelix can vary significantly from person to person and can influence the overall appearance of the ear.

Clinical Significance

Alterations in the shape or structure of the antihelix can have aesthetic and functional implications. Conditions such as prominent ears, where the antihelix does not fold properly, can lead to ears that stick out more than usual. This condition is often addressed with otoplasty, a type of cosmetic surgery aimed at reshaping the pinna.

Injuries to the antihelix, as well as congenital deformities, can affect the ear's ability to properly collect and direct sound, potentially impacting hearing. Additionally, the antihelix is a common site for piercings, which can lead to complications such as infections or keloid formation if not properly cared for.

See Also

• Auricle (anatomy)
• Ear canal
• Tympanic membrane
• Otoplasty

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