Which term describes the depression of the antihelix?

The term that describes the depression of the antihelix is "triangular fossa." This anatomical feature is located on the outer ear and refers specifically to the small, triangular-shaped depression between the crura of the antihelix. It is an important landmark in the structure of the ear and can be used as a reference point in various medical and audiological assessments.

In contrast, the concha refers to the bowl-shaped area of the external ear that leads to the ear canal, while "petrous" pertains to the petrous part of the temporal bone, which contains the inner ear structures, and is not directly related to the external features of the ear. The lobe, or earlobe, is the soft, fleshy part at the bottom of the ear; it does not describe any depressions associated with the antihelix. Thus, triangular fossa is the most precise and accurate description in this context.