Editing Openai/691a41cd-2efc-800c-9eff-de439224a90d (section)

==== The nervous system is the body’s communication and control network. It has two main parts: ====
* Central nervous system (CNS) – brain and spinal cord
* Peripheral nervous system (PNS) – all the nerves branching out to the rest of the body

Within this system:
* Neurons send electrical and chemical signals
* Glial cells support, protect, and nourish neurons
* Synapses are the tiny junctions where signals pass from one neuron to another

The brain itself has major regions:
* Cerebrum – thought, memory, movement, sensation, language
* Cerebellum – coordination, balance, fine-tuning movement
* Brainstem – breathing, heart rate, consciousness, basic life functions
* Spinal cord – main highway for signals to and from the body

When neurologists diagnose disease, they think in terms of:
* Where is the problem? (localization)
* What is the process? (stroke, infection, degeneration, immune attack, etc.)
* How fast did it happen? (seconds vs. months or years)