Theory:

Receptors and sense organs:
ReceptorsandSenseOrgans.png
Human Nervous System:
nervous-system-_2_.jpg
Human nervous system - Brain & Spinal cord:
Screenshot31.jpg
 
Classifications of human nervous system:
Nerv_2.jpg
Autonomic Nervous System:
Autonomic_nervous_system_main_figure_Blessing.gif
Reference:
https://cmapspublic.ihmc.us/rid=1155931214078_549686258_7445/Human%20Nervous%20System.cmap
https://cmapspublic.ihmc.us/rid=1211337068109_1777319205_32505/nervous%20system.cmap
http://learn.neurotechedu.com/the_nervous_system/
http://www.scholarpedia.org/w/images/d/d3/Autonomic_nervous_system_main_figure_Blessing.gif