A coil forming the shape of a straight tube (a helix) is called a solenoid. This invention was the first vacuum tube. The anode is at one end of a cylindrical tube. It stored data as electrically charged spots on the face of a cathode ray tube. Older monitors used a cathode ray tube (CRT). The sperm cells are carried to their destination in the tip of the pollen tube. The spinal cord is made from part of the neural tube during development. This is particularly a concern with steel tube construction. Governor Bush immediately ordered the feeding tube reinserted. The notochord of the lancelet protrudes beyond the anterior end of the neural tube. An effective stern tube and associated bearings were required. John Fleming invented the first radio tube, the diode, in 1904. The small intestine develops from the midgut of the primitive gut tube. Evidence for benefit from nasogastric tube feeding, however, is unclear. The esophagus develops as part of the foregut tube.