part of part of has potential to develop into has potential to develop into embryo foregut lower respiratory tract larynx trachea laryngotracheal groove Wikipedia:Laryngotracheal_groove UBERON:0006257 laryngo-tracheal tube NCIT:C34198 EMAPA:16739 laryngotracheal endoderm A groove in the floor of the pharynx formed from the ventral diverticulum of endoderm that arises from the floor of the foregut caudal to the pharynx. This structure is the precursor for the larynx and trachea[WP,edited]. UMLS:C1283960 Lung development begins with the appearance of the laryngotracheal groove, which is a small diverticulum that arises from the floor of the primitive pharynx at E9 in mouse and 4 wk in human.[well established][VHOG] RETIRED_EHDAA2:0000909 laryngo-tracheal groove EHDAA2:0004073 SCTID:361426003 sulcus laryngotrachealis VHOG:0001404 EHDAA:1005 Note we currently have pharynx as part of the upper respiratory tract - separate by development? surface groove