part of develops into embryonic/larval ganglionic tracheal branch tracheal pit tracheal branch primordium ganglionic tracheal branch primordium Precursor of the embryonic/larval ganglionic branch. It originates as the region of the posterior trunk lateral branch proximal to the lateral spur that becomes the point of fusion between anterior and posterior lateral trunk branches. i branch embryonic ganglionic branch fly_anatomy.ontology ventral ganglionic branch ganglionic trachea FBbt:00005591 primary segmental tracheal branch primordium