part of part of develops_from embryo pharyngeal arch 1 developing anatomical structure lingual swellings lateral lingual swelling 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. EHDAA2:0000911 EMAPA:17189 FMA:313628 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] UBERON:0006757 VHOG:0000731 lateral lingual prominence lateral swellings paired tuberculum laterale tuberculum linguale laterale uberon