(A–C) Respective views of combined, airway and vascular reconstructions close to the infundibulum. The labelling of the BCs (symbols) and the ACs (letters) is similar to show the topographical locations of the same structures. The infundibulum (If) gives rise to ACs. Scale bars, 10 μm. (D) Vascular reconstruction close to the parabronchial lumen showing an atrial vein (AV) and blood capillaries (BC). PL, parabronchial lumen; If, infundibulum; At, atrium. Scale bar, 25 μm. (E) Spaces for ACs (letters) and some BCs (symbols). PL, space for parabronchial lumen; At, space for an atrium; If, space for an infundibulum. Scale bar, 25 μm. (F) Blood capillaries (BC) and atrial vein (AV) are outlined to highlight the intensity of vascular anastomoses. Scale bars, 25 μm.