part_of part of part of develops_from develops from develops from embryonic structure pharyngeal arch 1 lingual swellings lateral lingual swelling http://upload.wikimedia.org/wikipedia/commons/5/5c/Gray979.png Most adult amphibians have a tongue, as do all known reptiles, birds and mammals. Thus it is likely that the tongue appeared with the establishment of tetrapods and this structure seems to be related, to some extant, to the terrestrial lifestyle.[well established][VHOG] During the third week there appears, immediately behind the ventral ends of the two halves of the mandibular arch, a rounded swelling named the tuberculum impar, which was described by His as undergoing enlargement to form the buccal part of the tongue. More recent researches, however, show that this part of the tongue is mainly, if not entirely, developed from a pair of lateral swellings (or distal tongue bud) which rise from the inner surface of the mandibular arch and meet in the middle line. UBERON:0006757 uberon lateral swellings Wikipedia:Lateral_lingual_swelling paired EHDAA2:0000911 lateral lingual prominence FMA:313628 VHOG:0000731 tuberculum linguale laterale tuberculum laterale EMAPA:17189