The nervous system is divided into the central nervous system (CNS) and peripheral nervous system (PNS). The CNS contains the brain and spinal cord, while the PNS contains motor and sensory neurons. The somatic nervous system controls voluntary movement through skeletal muscles and the autonomic nervous system regulates organs and smooth muscles, divided into the sympathetic and parasympathetic systems for fight-or-flight responses and maintenance.

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4. The Nervous System
Central Nervous System (CNS) Peripheral Nervous System (PNS)
Brain Spinal Cord Motor Neurons Sensory Neurons
Somatic Nervous System Autonomic Nervous System
• voluntary movements via • organs, smooth muscles
skeletal muscles
Sympathetic Parasympathetic
- “Fight-or-Flight” responses - maintenance

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15. A junction where the axon
or some other portion of
one cell (= presynaptic
cell) terminates on the
dendrites, soma, or axon
of another neuron (post
synaptic cell).
The term was introduced
in nineteenth century by
the British
neurophysiologist Charles
Sherrington