In Vivo MR Microneurography of the Tibial and Common Peroneal Nerves

Figure 3

3D SPGR FS. Axial section of the neurovascular bundle at the ankle with the tibial nerve and the corresponding schematic diagram. In-plane resolution is ~100 μm. The paraneural sheath is hyperintense. The epineurium and the epineurial fat (Epi/Fat) appear hypointense because the fat is suppressed and the epineurium has a fibrous structure with low signal. The perineurium (Peri) is hyperintense. The artery (A) demonstrates a thicker wall compared with the paired veins (V). The neurovascular bundle is surrounded by a fatty, supporting tissue and enclosed within a thicker connective fascia.