Fig. 2. Unmyelinated axons along the AN. (A) is a low magnification image of an H&E-stained section through the cavernous segment of the AN. The fascicles indicated by black asterisks are composed of myelinated axons; the fascicles indicated by the black arrowheads are largely composed of unmyelinated axons. (B) shows a higher magnification view of the region indicated by the black dashed box. Individual myelinated axons are indicated by the black arrows. (C) shows a higher magnification view of the region indicated by the blue dashed box. This bundle of axons (blue asterisk) contains mainly unmyelinated axons; myelinated axons are indicated by the black arrows. (D) shows a higher magnification view of the region indicated by the red dashed box. This fascicle contains only unmyelinated axons and a collection of neuronal cell bodies (yellow arrows). The scale bar in A is equal to 300 mm; the scale bar in D is equal to 40 mm and applies to B–D. AN, abducens nerve.
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