Chp 12 brain wave patterns EEG

known as “idling” brain. This is regular rhythmic, low-amplitude, synchronous waves 8-13Hz

alpha waves

these are rhythmic but less regular higher frequency waves this occurs when mentally alert 12-30Hz

beta waves

these are irregular common in children but uncommon in awake adults sometimes will aprear when concentrating 4-7Hz

theta waves

High-amplitude waves during sleep can indicate brain damage in awake adults

Delta waves

What is an epileptical seizure

excessive electrical discharge by a bunch of neurons

what are some things someone might experience during a seizure

may lose consciousness, or have visual or auditory hallucinations

what is the most sevre version of a epileptic seizure

tonic-clonic

what inhibits the RAS (reticular activating system) putting the cerebral cortex to sleep

hypothalamus

what does the hypothalamus do at the end of the sleep cycle

release orexins wakes up the cortex

what forms cerebral spinal fluid

ependymal cells in choroid plexus

what are some function of the cerebral spinal fluid

floats the brain to reduce weight, absorbs shock, carries nutrients hormones and waste,

why are their tight junctions between ependymal cells

because neurons are sensitive to changes in fluid environment

what are responsible for maintaining the blood brain barrier

astrocytes

excess CSF build up is known as what

hydrocephalus

where are the two places that don’t have the BBB

hypothalamus and vomting center of brain (monitors toxins)