Abnormal antihelix morphology Abnormality of superior crus of antihelix 2011-12-18T11:52:06Z An abnormality of the superior crus of the antihelix is the upper cartilaginous ridge arising at the bifurcation of the antihelix that ends beneath the fold of the ascending helix, and separates the concha from the triangular fossa. HP:0011245 The inferior antihelical crus runs in an anterior and slightly superior direction, and is usually sharply defined, and appears less variable than its superior counterpart. A synonym is anterior crus of the antihelix. UMLS:C4021190 Abnormality of posterior crus of antihelix