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3 main functions of nervous system
- -sensory input
- -integration
- -motor input
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2 main parts of a neuron and what they contain;
- -cell body (nucleus, nissl substance, neurofibrils)
- -processes (axons and dendrites)
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what do myelin sheaths do to help the fibers on a neuron
help nerver fibers transmit messages, insulation, and protection
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what do the left and right hemisphere control
- left; controls math, analytical and language
- right; creativity, artisitic ability, and spontaneous thoughts
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what is the spinal cord responsible for
involuntary actions such as reflexes, heart rate, breathing, sleeping, and blood pressure
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how is a stroke caused?
by a clot in blood vessel to brain
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brain tumors are caused by
brain cells that go through mitosis uncontrollably
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the thalamus is
relay station for sensory impulses
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hypothalamus deals with
regulating the body temperautre, water balance, and metabolism
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the epithalamus..
forms cerebrospinal fluid
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astrocytes;
star shaped cells, control chemical environment of brain
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microglia;
spider like phagocytes, dispuse of debris
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ependymal cells;
circulate cerebrospinal fluid and line caviites of brain n spinal
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sateliitle cells;
protect neuron cell bodies
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diencephalon made of 3 parts:
- -thalamus
- -hypothalamus
- -epithalamus
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sits on top of brain stem
diencephalon
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lowest part of brain stem
medulla
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5 means of protection in NS
- -scalp
- -cerebralspinal fluid
- -meninges
- -blood brain barrier
- -skull
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sympathetic NS
organ responses in fight or flight division; spinal cord controls in this
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parasympathetic NS
rest and digest division cranial nerves
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nerve impusles away from cell body
axons
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nerve impulses toward cell body
dendrites
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space btw axon ending of 1 neuron n dendrite of another
synaptic cleft
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acetylcholine stimulates
muscles
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part of brain responsible for body movements
cerebellum
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brain n spinal cord are covered by protective layers
meninges
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white matter is composed of
extensions
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gray matter is composed of
neuron cell bodies
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what lobe initiates motor input?
frontal
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area thats associated w/ speech
broca's
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this helps control functioning of most interal organs n control secretres of pit. gland
hypothalamus
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nerve impulses to and from brain
cranial
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nerves that take impusles to and from spianl cord
spinal
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frontal lobe
speech, thought, emotion, movement learning
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pareital lobe;
body sensations
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