EEG Flashcards
what is positiv eeg wave due to?
- apical IPSP
- perisomatic EPSP
what is negative eeg wave due do?
- apical EPSP
- perisomatic IPSP
frequency of
- alpha
- beta
- theta
- delta
- delta 0,5-4
- theta 4-8
- alpha 8-13
- beta 13-30
whats epileptic seizure?
- excesive discharge of electrical activity in cortex which can be partial ( part of brain) or generalized ( larger region of brain.
name example of partial seizure?
- partial simple (jacksonian march) , consious
- partial complex ( psychomotor epilepsy) unconsious
name examples of generalized seizure?
- grand mal: aura, sec-4 min of unconsious, bite and swollow tongue
- petit mal: 3-30 seconds of unconsious, twitchlike contractions
how long is circadian rythm?
25 hours
how can melatonin be released?
blue light–> melanopsin–> retinohypothalamic tract –> suprachiasmatic nuclei–> inhibits sympathetic system–> NE released in pineal gland–> release of melatoin
sleep cycle and its stages?
stage 1: alpha wavens interspersed with theta waves
stage 2: slower eeg with sleep spindles and K complex
stage 3: delta waves
stage 4: delta waves with no spindles
what happens with body when u sleep?
- muscles relax
- GI tract motility increases
how does hypothalamus control sleep?
controls with
- VLPO–> inhibits ascending arousal system–> allows sleep
- Orexin from laterl hypothalmic area–> stabilizes ascending arousal system
what can deficiency of orexin lead to?
- narcoelepsy
what can inhibition of VLPO cause, what can inhibit it?
- can cause Insomnia
- GABA, His, NE, 5HT
how circardian cycle work?
the circardian cycle works like this ( draw the pic) whenhomeostatic need for sleep become great enough the flipflop circuit give way of reverse
