title: Fiber sizes and frequencies in the optic nerve of Rana esculenta.
mesh_terms: D000818:Animals; D001001:Anura / Q000033:anatomy & histology*; D006652:Histological Techniques; D008433:Mathematics; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D009186:Myelin Sheath; D009413:Nerve Fibers, Myelinated; D009474:Neurons; D009900:Optic Nerve / Q000033:anatomy & histology*