Description A. Illustration; B. Schematic diagram of transverse section through the region indicated by the arrowheads in A; C. Photomicrograph.Author Artois, TomPNG file - 923.36 kB - 744 x 1 018 pixelsadded on 2018-08-131 498 views This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License