The process of folding the neuroepithelium around the medial hinge point to create the neural elevations, and around the lateral hinge points to produce convergence of the folds. [ http://purl.obolibrary.org/obo/go/references/0000021 http://www.ncbi.nlm.nih.gov/pubmed/13679871 GOC:dph http://www.ncbi.nlm.nih.gov/pubmed/15806586 GOC:jid GOC:cls GOC:dgh ]