nervous system Flashcards
what is the nervous system
system of cells that
- sense information in and around the body ,
- process or “make sense” of that information,
- respond to that information
main cell type of nervous system
neuron
nervous system box
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the nervous system can broken down into what two arts
the central nervous system (CNS), Peripheral Nervous System (PNS)
CNS
brain, brain stem and spinal cord
PNS
nerves outside the CNS
how many neurons are inside brain
86 billion
the brain is like a what
processing center for information
what happens with signals in the brain
signals are sent here, compiled and then a response signal is sent away
the brain had many parts that what
reuglate different processes
what is the brain stem
a 3 inch region at base of the brain
what is regulated in the brain stem
involuntary activities
the three parts of the brain stem
the midbrain, the pons, the medulla Oblongata
what is midbrain
has oversight over vision hearing and alertness, most superior
what is pons
has oversight over breathing, connects brain to spinal cord
what is medulla oblongata
has oversight over heart rate, blood pressure, and vomiting , most inferior
where does the spinal cord run
through the spine
the spinal cord is like a what
“two way street” that carroes signals to and from the brain
what is coordinated at the spinal cord
reflexes are coordinated here, they do not go all the way up to brain because it is faster this way
what happens with spinal cord injury
loss of control over all nerves at and below injury
loss of functions at and below break of spine
paraplegia
what is the somatic nervous system apart of
PNS
what does the somatic nervous system do
controls voluntary actions like moving
what are the two parts of the somatic nervous system
sensory and motor