Nervous System Posted on 9th December 20158th October 2020 by ThePD (The Project Definition) Nervous System is the network of nerve cells and fibres that is a complex, sophisticated system that regulates and coordinates body activities. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in HSE and tagged health. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.