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. 2021 Jan 7;14:1–12. doi: 10.2147/JPR.S255726

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© 2021 Visnjevac et al.

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Schematic of variability of dorsal root entry zone complex (DREZC) anatomy in correlation to typical radiofrequency cannula anatomic position. 1. Lumbar vertebra with spinal cord and sensory afferent pathway segments with magnified and labeled view box to the right side. The dorsal root entry zone complex (DREZC) is composed of components labelled A, C, E, and F. A. Dorsal Root Entry Zone (DREZ). B. Radiofrequency (RF) cannula in typical position, adjacent to the DREZC. C. Dorsal Rootlets (DRL). Herein artistically depicted as one line, but DRL can vary in number to as many as 15 DRL per DREZC. D. The anatomic distribution of the energy wave emitted by the RF cannula. E. Dorsal Root Ganglion (DRG). F. Dorsal root (DR). G. Ventral root. H. Medial branch. I. Intermediate branch. J. Lateral branch. 2–5 show variability in anatomic position and number of DRG relative to the vertebra and RF cannula. Arrow depicts DRG. 2. Intraforaminal DRG anatomy. 3. Intraspinal DRG anatomy. 4. Extraforaminal DRG anatomy. 5. DRG Bigangliar anatomy.