Fig. (4) Mean diameter of the lumen at positions mp1-mp5 in relation to mp5 (top number) and mp1 (bottom number). a. 3D surface model of the great intrathoracic arteries from right. b. 3D surface model of the great intrathoracic arteries from left. mp1 = measuring position 1; mp2 = measuring position 2; mp3 = measuring position 3; mp4 = measuring position 4; mp5 = measuring position 5. Scalebars = 200 µm.