part_of part of part of in_lateral_side_of embryonic structure neural groove neural fold http://braininfo.rprc.washington.edu/centraldirectory.aspx?ID=1364 uberon XAO:0004087 SCTID:361461009 UMLS:C0814993 One of the two elevated edges of the neural groove[GO,MP]. medullary fold UBERON:0005062 FMA:295618 EHDAA2:0001249 NCIT:C34223 Wikipedia:Neural_fold In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, make their appearance, one on either side of the middle line. These are named the neural folds; they commence some little distance behind the anterior end of the embryonic disk, where they are continuous with each other, and from there gradually extend backward, one on either side of the anterior end of the primitive streak. Also, after differentiation it turns into the neural tubes[Wikipedia:Neural_fold]. epithelial fold embryonic tissue lateral structure