of angle between the head and the ear, and the degrees of angle between the scapha and the concha, determine the concept of prominent ears. The study, Comparing Cephaloauricular and Scaphaconchal Angles in Prominent Ear Patients and Control Subjects (2008) reported that the comparisons of the head-to-ear angles and the scapaha-to-concha angles of a 15-patient cohort with prominent ears, with the analogous ear angles of a 15-person control group, established that the average head-to-ear angle was 47.7 degrees for the study group, and 31.1 degrees for the control group; and that the average scapha-to-concha angle was 132.6 degrees for the study cohort, and 106.7 degrees for the control group. Antihelix The antihelix normally forms a symmetric Y-shaped structure in which the gently rolled (folded) crest of the root of the antihelix continues upwards as the superior crus, and the inferior crus branches forwards, from the root, as a folded ridge. The root of the inferior crus of the antihelix sharply defines the rim of the concha. Moreover, the inferior crus also forms the wall that separates the concha from the triangular fossa. The root and superior crus of the antihelix form the anterior wall of the scaphoid fossa, and the helix forms the posterior wall. The triangular fossa dips within the Y-arms of the superior and inferior crura. The corrugated contours of these auricular crests and valleys provide a pillar effect (support) that stabilizes the pinna. The vertical walls of the conchal cup translate to a semi-horizontal plane as the concha merges with the folded crest of the antihelix. The scapha–helix is nearly parallel to the plane of the temporal surface of the head. If the roll of the antihelix and its crest are effaced and flat, rather than rolled or folded, the steep pitch of the conchal wall continues into the un-formed antihelix and scapha and ends at the helix, with little interruption. Said planar orientation places the scapha–helix complex nearly perpendicular to the temporal plane of the head — because of which the ear appears prominent, thus, such an ear also lacks the stability provided by the pillar effect, and so allows the superior auricular pole to protrude. In the literature, effacement (deficiency) of the antihelical fold is the foremost subject of most discussions of the prominent ear, because it is an aurical deformity manifested as a spectrum of defects and deformities — ranging from an indistinguishable antihelix