Fig. 1
Human embryo at 9 weeks 2 days of gestation, crown-to-rump length of 25 mm, stained by submersion for 90 h in 1.9% buffered Lugol solution (B-Lugol). Microfocus CT scan was obtained using a Phoenix Nanotom M (Waygate Technologies, Wunstorf, Germany). Scan parameters were 60 kV, 400 µA, 0.5-mm aluminum filter, 8.5-µm voxel size. a Sagittal image shows an overview of the anatomy, indicating the localization of the images in panels (b–e). b Transverse coronal image through the brain shows the parts of the neural tube, ventricles and choroid plexus. 4 fourth ventricle, C choroid plexus, D diencephalon, L lateral ventricle, Me metencephalon, My myelencephalon, T telencephalon. c Coronal image through the trachea and lungs. A aorta, E esophagus, LL left lung, RL right lung, Tr trachea. d Transverse image through the heart. LA left atrium, LV left ventricle, RA right atrium, RV right ventricle. e Sagittal image through the region of the right kidney. G gut, Go gonad, K kidney, SC spinal column, SG suprarenal gland