Fig. 3

Innervation of the SIJ in a swine. (a-g) Nerves (black color), contoured using 40× magnification, are visible in every section with the largest diameter branches in A and E. Vertebral lumbar and sacral bodies and ilium are labelled with L6,S1,S2 and I (ilium). (a) Cartilage (black asterisk) and ligament (black arrow) are marked. (c-g) Green asterisk indicates the tip of the ligament (long ligament). (a-g) SIJ is marked with black arrowhead. (e) S1-S2 dorsal foramen is shown with green arrows and the anterior sacral nerve roots are shown with dashed arrows. Scale bar is 5 mm