In Vivo MR Microneurography of the Tibial and Common Peroneal Nerves

Figure 4

Tibial nerve, axial sections. In 2D TSE T1 weighted image (a) the fascicles are hypointense surrounded by a hyperintense tissue, mainly the epineurial fat (Epi/Fat), while the fibrous part of the epineurium has low signal and surrounds the fascicles; it is not clearly seen. The paraneural sheath is also detected. In SPGR fat suppressed image (b), the fascicles are covered by a bright thin layer, the perineurium, best seen when the acquisition plane is exactly perpendicular to the nerve orientation, therefore minimizing the partial volume effects.

(a)

(b)