Chapter 1 18 The levator ani together with the diaphragm, the deepest abdominal muscle, the transversus abdominus, generates and controls intra-abdominal pressure and contributes to lumbar spine stiffness.26,27 The pelvic floor is innervated by the branches of the sacral plexus S2, S3 and S4.19 “Anterior view of female pelvis; internal organs and innervation - Latin and English labels” at AnatomyTOOL.org by Ron Slagter, LUMC, Marco DeRuiter, LUMC and O. Paul Gobée, LUMC, license: Creative Commons Attribution-NonCommercial-ShareAlike
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