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Human olfactory bulb stained with Cajal’s gold chloride sublimate method

Fernando de Castro (1896-1918) drawing of human olfactory bulb stained with Cajal’s gold chloride sublimate method. Legend: (A) Superficial substratum of the molecular layer with numerous cephalopodic cells. (B) Deep substratum. (C) Mitral cell layer. (D) Grains layer. (Source: De Castro, 1920. Instituto Cajal, Madrid, Spain. See: Figueres-Oñate M, Gutiérrez Y, López-Mascaraque L. Unraveling Cajal's view of the olfactory system. Front Neuroanat 2014;8:55. Creative Commons Attribution [CC BY] license, creativecommons.org/licenses/by/4.0.)