Fig 3. A, Thin-section (20 mm) oblique sagittal reconstruction plane in a 35-year-old volunteer clearly demonstrates the components of the sacral plexus. B, Thin-section (20 mm) oblique sagittal reconstruction plane in a 28-year-old volunteer. The relationship between the nerves and the piriformis muscle is clearly defined. C, The tiny branches of LSP are shown. The white arrow indicates the superior gluteal nerve, the black arrow indicates the posterior cutaneous nerves of thigh, and the arrowhead indicates the sciatic nerve