part of part of overlaps has developmental contribution from embryo ectoderm endoderm stomodeum chordate pharynx septum buccopharyngeal membrane EHDAA2:0000189 The thin bilaminar membrane derived from the prechordal plate that is devoid of mesoderm and formed by the apposition of the stomodeal ectoderm with the foregut endoderm; after the embryonic head fold has evolved it lies at the caudal limit of the stomodeum, forming a septum between the primitive mouth and pharynx; the membrane eventually disappears, and thus a communication is established between the mouth and the future pharynx. UBERON:0006211 Wikipedia:Buccopharyngeal_membrane SCTID:361412007 oral membrane VHOG:0000380 EMAPA:16259 FMA:313607 EHDAA:536 oral plate oropharyngeal membrane mouth-foregut junction