Cartilage that is the dorsal component of the first pharyngeal arch. It is roughly triangular with slightly concave dorsal edges and convex ventral edges. The anteroventral corner gives rise the quadrate and articulates with the posterior end of Meckel's cartilage. The anterodorsal tip articulates with the lateral edge of the ethmoid plate and the posteroventral edge articulates with the anterodorsal edge of the hyosymplectic. [ ORCiD:0000-0002-2244-7917 GOC:cvs http://zfin.org/ZDB-PUB-961014-192 ]