part of part_of part of part_of anatomical conduit ectoderm-derived structure notochordal process notochordal canal A tubular passage that extends from the primitive pit into the head process during the early stages of embryonic development in mammals. It perforates the splanchnopleure layer so that the yolk sac and the amnion are connected temporarily. FMA:293127 NCIT:C34230 UBERON:0013704 UMLS:C1518428 chordal canal uberon