Antihelical

Antihelical is an anatomical term describing structures related to the antihelix, the curved ridge on the inner part of the external ear (auricle) that lies opposite the helix. The antihelix runs within the ear and gives rise to two crura (crura of the antihelix), typically described as superior and inferior, which together help define the contours of the ear, including the triangular fossa between them. The term is used to distinguish features of the ear that relate to the antihelix from those relating to the helix.

In broader usage, antihelical refers to anything situated or oriented toward the antihelix. For example, antihelical folds or contours describe the inner ridges that help shape the pinna. The antihelix plays a significant role in the overall appearance of the ear and can be a focus in cosmetic procedures.

Clinical relevance: In otoplasty (cosmetic ear surgery), surgeons may modify the antihelical region, such as creating or refining an antihelical fold, to improve ear projection or symmetry. Variations in antihelical prominence are common among individuals and contribute to ethnically and individually diverse auricular shapes. Trauma, congenital conditions, or surgical changes can alter the antihelix and, consequently, the ear’s silhouette.

Etymology: The term derives from anti- (opposite) and helix (spiraled rim), reflecting its relationship to the outer rim of the ear.

See also: helix, auricle, antihelix, concha, otoplasty.