part of part of in taxon Eumetazoa ectoderm stomodeum http://upload.wikimedia.org/wikipedia/commons/9/93/Gray977.png UBERON:0000930 ZFA:0001290 UMLS:C1514977 EMAPA:16263 TGMA:0000135 oral ectoderm NCIT:C34306 Wikipedia:Stomodeum stomodaeum stomodeal mouth primordium stomodeal-hypophyseal primordium BTO:0004224 EHDAA2:0001929 Anterior part of the embryonic digestive tract that develops into a mouth. The stomodeum includes as parts an invagination of the ectoderm and the stomodeal cavity. Anterior part of the embryonic alimentary canal formed as an invagination of the ectoderm; the future mouth.[TAO] primitive oral cavity FBbt:00000439 stomatodeum oral pit the primordial mouth region of the developing head, initially a midline ectodermal depression between the forebrain bulge (cranially) and the heart bulge (caudally) and between the maxillary and mandibular components of the first pharyngeal arch; the stomodeum is separated from the anterior end of the foregut by the buccopharyngeal membrane; the mouth is developed partly from the stomodeum, and partly from the floor of the anterior portion of the foregut; the lips, teeth, and gums are formed from the walls of the stomodeum, but the tongue is developed in the floor of the pharynx FMA:295846 consider indicating location. e.g. anterior. Note some AOs place this as part of oral opening, but it's not clear when this structure comes into existence XAO:0000269 This class groups together disparate structures as all being the anterior part of the early metazoan digestive tract and precursor of the mouth. However, the developmental processes vary, so this class may be split in future. E.g. in mammals it is a rostral depression surrounded by prominences. Outgrowth of the prominences produces a stomodeal cavity. TAO:0001290 mouth pit subdivision of tube future mouth