What are the main organs in nervus system?

Central nervous system:

- Brain: The brain is the primary organ of the central nervous system and serves as the command center for the entire body. It processes and coordinates information from the senses, controls voluntary movements, regulates vital bodily functions, and is responsible for higher cognitive abilities such as thought, memory, and reasoning.

- Spinal cord: The spinal cord is a long, cylindrical structure that runs from the brain down the back. It serves as a communication pathway between the brain and the rest of the body, transmitting sensory information to the brain and motor commands from the brain to the muscles.

Peripheral nervous system:

- Sensory (afferent) neurons: Sensory neurons transmit information from the body's sensory receptors to the central nervous system.

- Motor (efferent) neurons: Motor neurons carry signals from the central nervous system to the muscles, causing them to contract and produce movement.

- Autonomic nervous system: The autonomic nervous system is a division of the peripheral nervous system that regulates involuntary bodily functions such as heart rate, digestion, and respiration. It has two branches:

-- Sympathetic nervous system: The sympathetic nervous system prepares the body for "fight or flight" responses, such as increasing heart rate, dilating pupils, and slowing digestion.

-- Parasympathetic nervous system: The parasympathetic nervous system promotes "rest and digest" activities, such as decreasing heart rate, constricting pupils, and stimulating digestion.