2015, Vol.6 No.1 Cross-sections of the abducens nerve in various age groups. Panel of low magnification (left column) and high magnification (right column) photomicrographs of toluidene blue stained semithin resin sections of trochlear nerves showing the Epineurium (Epi) and Perineurium (Peri). The darkly stained profiles seen in the micrographs are the myelin sheaths surrounding the axons of the abducens nerve. A. and B. are of a 16 year old female; C. and D. are of a 24 year old female; E. and F. are of a 45 year old male and G. and H. are of a 61 year old man. Scale bar: A = 500 μm. C = 300 μm. B = D = 50 μm.