- US/EU Patent Pending - Twelve cranial nerves... One app! Change the way you see, study, search and understand human anatomy. The twelve cranial nerves re-imagined... iCat Medical Software proudly presents: nTube™ Exploring the twelve cranial nerves was never so easy, simple and intuitive. Follow the course of the twelve cranial nerves in a simple straight line with stops, stations, exits and entries and discover the beauty of the human brain. Discover the beauty of simplicity. Tap on any stop/ station/ entry or exit to for details of the nerve oyu are following! Simple and intuitive. The way apps should be.