TOPICS: Radiculopathy, herniated disc, spinal stenosis, central canal, nerve root compression, ligamentum flavum, disc degeneration, facet joint arthropathy, spondylolisthesis, conus medullaris, sciatica, sciatic nerve, nucleus pulposus, annulus fibrosus, central canal, mammillary process, dermatome, myotome, reflexes, straight leg test, biceps reflex, triceps reflex, cremaster reflex, patellar reflex, Achilles reflex, anal wink reflex, C2, C3, C4, C5, C6, C7, C8, T1, T4, T7, T10, L1, L2, L3, L4, L5, S1, S2-S4