antihelix

The antihelix is a curved, elevated rim of the external ear (auricle) located on the inner side of the pinna, medial to the helix and surrounding the concha. It forms the inner contour of the ear and helps define its rounded profile.

Anatomically, the antihelix consists of two crura, the crura superioris (superior crus) and the crura inferioris (inferior crus). These two limbs extend from the upper and lower portions of the concha and diverge to create a Y-shaped ridge. The area between the crura is the fossa triangularis, and the antihelix contributes to several adjacent concavities that shape the ear’s central region. The antihelix ends near the lobule and blends with surrounding cartilage.

Clinical and functional notes: Variation in size and shape of the antihelix is common among individuals. It is a key landmark in otoplasty and other ear surgeries where reshaping or folding of this structure can modify ear projection. Traumatic injury, congenital differences, or inflammatory conditions can deform the antihelix, potentially affecting the ear’s contour and appearance.