title: Factors affecting cerebrospinal fluid flow in two spinal needles.
mesh_terms: D002555:Cerebrospinal Fluid; D004867:Equipment Design; D008855:Microscopy, Electron, Scanning; D009339:Needles; D013057:Spectrum Analysis; D013129:Spinal Puncture / Q000295:instrumentation*; D014965:X-Rays