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Olfactory bulb section of a month-old rat, Weigert-Pal method

Cajal drawing of an olfactory bulb section of a month-old rat. Weigert-Pal method. Legend: (A) Layer of the glomeruli. (B) Lower molecular layer. (C) Mitral layer. (D) Higher molecular layer. (E) Coating the grains. (a) Myelin fiber corresponding to the cylinder-axis of mitral cells. (b) Cylinder-axis of mitral cells. (c) Core fiber from within the glomeruli. (d) Bundles of fibers in the layer of grains. (e) Thin horizontal strands from the higher molecular area. (f) Mitral cells. (g) Glomerulus. (Source: Ramón y Cajal, 1890. 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.)