A medial cartilaginous spur that develops from the dorsomedial edge of the palatoquadrate. It is derived from cells located in the maxillary prominence of the first pharyngeal arch and gives rise to the metapterygoid. [ GOC:cvs http://zfin.org/ZDB-PUB-100726-23 ORCiD:0000-0002-2244-7917 http://zfin.org/ZDB-PUB-961014-192 ]