title: Observations on the phrenic nerves and the ductus venosus in human embryos and fetuses.
mesh_terms: D002447:Celiac Plexus / Q000196:embryology; D003964:Diaphragm / Q000196:embryology / Q000294:innervation; D005865:Gestational Age; D006801:Humans; D010791:Phrenic Nerve / Q000196:embryology*; D012834:Silver; D013194:Staining and Labeling; D014471:Umbilical Veins / Q000196:embryology; D014680:Veins / Q000196:embryology*; D014682:Vena Cava, Inferior / Q000196:embryology / Q000294:innervation
chemical_list: D012834:Silver