A Visual Introduction to Human Anatomy

Use the Visible Body Learn Site’s text, illustrations, and animations to learn and communicate basic human biology concepts. Enjoy!

The brain and spinal cord make up the central nervous system (CNS). The cranial nerves, spinal nerves, and sensory organs make up the peripheral nervous system (PNS).

The Most Complex System: Five Key Functions of the Nervous System

Did you know that the nervous system is the most complex body system? Learn about the functions of the central and peripheral nervous systems, and what it means for a neuron to be a charged cell. What are the two types of neurotransmitters, and how do they regulate the nervous system? Why is the spinal cord so important? How does the limbic system connect your senses to memory and emotion?