part of start stage end stage palatoquadrate cartilage pterygoid process 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. Ceri zebrafish_anatomy ZFA:0005902 2018-09-12T09:53:49Z Ptp cartilaginous projection larval:protruding-mouth larval:days 14-20