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function of a neuron
connects brain to spinal cord to body`
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parts of the neuron
dendrite, cell body, axon
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function of myelin sheath
covers and insulates axon so that messages can be sent faster
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function of nodes of Ranvier
saltatory conduction
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what is multiple sclerosis
chronic disease of the CNS
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what is Guilian-Barre Disease
acute disease of the PNS
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the two parts of the autonomic nervous system
sympathetic and parasympathetic
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what is sypathetic NS
fight-or flight, pupils dilate, heart rate increases, digestion slows down,dilates bronchi
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what is parasympathetic NS
rest and digest, pupils contract, heart rate decreases, digestion is simulated, constricts bronchi
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function of somatic nervous system
controls voluntary muscles and senses
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what are the layers of the meninnges(outter to inner)
Dura mater, arachnoid mater, pia mater
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functions of the central spinal fluid
- acts as a cushion when the head moves to prevent the brain from hitting against skull
- washes away metabolic waste from the brain
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function of arachnoid granulations
removal of waste and excess CSF
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What cause hydrocephalus
- increased CSF production
- blocked CSF circulation
- decreased CSF absorption
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main dermatones
- C1-no dermatone
- C7- middle finger
- T4- nipple line
- T10- bellybutton
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what is a sulcus
groove on brain surface
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fissure
deep furrow or cleft
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gyrus
elevated, rounded folds on cerebrum
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function of frontal lobe
- voluntary movement
- high cognitive function
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what do the premotor complew and primary motor cortex make up
precentral gyrus
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