Nervous System Flashcards
Autonomic
Do not have to think about
What are the 2 sub divisions of the nervous system
Central nervous system
Peripheral nervous system
What is the CNS composed of?
Spine, brain
What is the PNS composed of?
Everything outside, afferent and efferent.
Afferent
Sensory Neurons, detect information from surroundings
Efferent
Motor nurons, respond to change
Stimulus
Changing of environment
Nervous system
Sends and receives info
Accommodation
Getting used to a new thing ( nerves stop sending info about it.
Stimuli
Changes ate called stimuli
Involuntary
Some are involuntary while others are not
Neurons
Specialized cell that carry messages
What are the 3 parts of the dendrita
Dendrite, cell body, axon are part of nerons
Cell body
Part of neuron that contains the nucleus
Axon
Long thread like part of a nerve cell along which impulses are conducted from the cell body to other cells
What are the three types of neurons
Sensory neurons
Inteneurons
Motor neurons
Sensory neurons
Sence things
Inteneurons
In spinal cord
Motor Neurons
Reflexes
What are the three neurons called
Reflex arch
What are the 2 forms of nerve impulses
Electrical and chemical signals
What is the most important part of the nervous system
Brain
What are the 3 parts of the brain
Arachnoid
Mermigie
Duramatter
Arachnoid
Inner layer, clings to surface of the brain
Mermigis
Fluid keeps things in place
Duramatter
Outer layer, prevents brain from smashing into skull
Concussion
When brain smashes against skull
Meningitis
Infection of mermigis
Cerebrum
Voluntary control, largest part, attitude, emotions, learning, etc
Right half
Artistic ability
Left half
Mathematical ability
Cerebellum
Back of brain, looks like a cauliflower, responsible f or coordination of muscle movement
Medulla
Controlling involuntary movements
How much of our Cerberus use
About 10%
How many sections is the spinal cord made of
two
What are the 2 sections of the spine
Spinal cord, vertebrae
What do the vertebrae do
Protect spinal cord
Reflex arc
Certain movements are involuntary
What are the parts of the reflex arc
Receptor Sensory neuron Interneuron Motor neuron Affected neurons
Receptor
Anything that can perceive the surrounding environment
Does the PNS link with the CNS
Yes
How many pairs of nerves are there in the PNS
43 pairs
What are cranial nerves
PNS nerves that come out of brain (12)
What are many nerves in the PNS under control of
Conscious mind
Aotonomic nervous system
Controls involuntary movements
Nerves are on pairs and are antagistic
Antagistic
Work against each other
Is the motor nervous system automatic
No it is not automatic (somatic)
