has part has part has_part characteristic of has modifier palatal shelf hypoplasia decrease in the number of normal cells in normal arrangement in the palatal projections from the inner part of the maxillary processes that fuse to form the secondary palate, typically resulting in decreased size MP:0009883 2010-01-19T02:53:02Z hypoplastic palatal shelf csmith MPheno.ontology decreased palatal shelf size abnormal hypoplastic secondary palatal shelf