nervous system
Body's signal infrastructure
The nervous system is the network of nerve cells and fibers that transmits signals throughout an animal's body.
In vertebrates, it comprises the brain, spinal cord, and peripheral nerves—coordinating sensation, movement, and thought.
The drug affects the central nervous system.
Figuratively, someone who serves as the nervous system of an organization is its communication and coordination hub.
Seat of cognition
- spinal cordBrain's extension through vertebrae
- neuronsSignal-transmitting brain cells
- axonNeuron's signal-sending projection
- dendriteNeuron's input branch
synapse · myelin sheath · cerebrum · cerebellum · medulla oblongata · ganglion · sensory neurons · motor neurons
Neuron's rapid electrical discharge
- impulseSudden urge to act
- synapseNerve signal crossing point
- receptorSignal-receiving molecule
- electrical signalInformation via current
potassium channels · vesicle · excitation · inhibition · propagation · firing · depolarization · repolarization
In the middle, primary
- peripheralExternal computer add-on
- autonomicSelf-regulating without awareness
- somaticConcerning the body
- sympatheticFeeling others' emotions
parasympathetic · enteric · afferent · efferent · voluntary · involuntary · fight-or-flight · cranial
Installed electrical conductors
- circuitryInterconnected electronic components
- networkInterconnected system
- hardwiredPermanently connected by wires
- signalsConveyed indications
connections · processing · central command · control center · feedback loop · overloaded · short-circuit
Progressive loss of neurons
- multiple sclerosisAutoimmune demyelinating neurological disease
- Parkinson'sNeurodegenerative motor disorder
- Alzheimer'sDegenerative brain disease
- epilepsyBrain disorder causing seizures
stroke · paralysis · neuralgia · meningitis · encephalitis · demyelination · tremor · seizure
Automatic physical responses
- sensationPerceived stimulus or phenomenon
- perceptionMental interpretation of stimuli
- coordinationOrganized cooperative movement
- cognitionMental knowledge acquisition
memory · movement · balance · homeostasis · arousal · consciousness · temperature regulation · heart rate
brain
Seat of cognition
- spinal cordBrain's extension through vertebrae
- neuronsSignal-transmitting brain cells
- axonNeuron's signal-sending projection
dendrite · synapse · myelin sheath · cerebrum · cerebellum · medulla oblongata · ganglion · sensory neurons · motor neurons · interneurons
action potential
Neuron's rapid electrical discharge
electrical signal · potassium channels · vesicle · excitation · inhibition · propagation · firing · depolarization · repolarization · threshold
central
In the middle, primary
- peripheralExternal computer add-on
- autonomicSelf-regulating without awareness
- somaticConcerning the body
sympathetic · parasympathetic · enteric · afferent · efferent · voluntary · involuntary · fight-or-flight · cranial · spinal
wiring
Installed electrical conductors
- circuitryInterconnected electronic components
- networkInterconnected system
- hardwiredPermanently connected by wires
signals · connections · processing · central command · control center · feedback loop · overloaded · short-circuit
neurodegeneration
Progressive loss of neurons
- multiple sclerosisAutoimmune demyelinating neurological disease
- Parkinson'sNeurodegenerative motor disorder
- Alzheimer'sDegenerative brain disease
epilepsy · stroke · paralysis · neuralgia · meningitis · encephalitis · demyelination · tremor · seizure · numbness
reflexes
Automatic physical responses
- sensationPerceived stimulus or phenomenon
- perceptionMental interpretation of stimuli
- coordinationOrganized cooperative movement
cognition · memory · movement · balance · homeostasis · arousal · consciousness · temperature regulation · heart rate · digestion
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- body systems
- systemsecosystems, ecosystem, transportation network, power grid, smart grid
- Hidden Systemsunderground pipes, sewers, plumbing, wiring, roots
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- connectionslink, links, connect, connection, tie
nervous systemcirculatory system
Heart, vessels, blood together
digestive system · cardiovascular system · skeletal system · respiratory system · muscular system
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