abnormal zygomatic arch morphology thick neurocranium thick zygomatic arch 2017-11-10T11:44:09Z MP:0030376 increased zygomatic arch thickness thick malar arch thickened zygomatic arch increased thickness of the bony arch that, in vertebrates, extends along the side or front of the skull beneath the eye socket and is formed by the temporal process of the zygomatic bone and the zygomatic process of the temporal bone MPheno.ontology thick zygoma increased thickness of the zygomatic arch