Sleep anatomy etc.

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Transcript of Sleep anatomy etc.

Page 1: Sleep anatomy etc.

SLEEP

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BIOLOGICAL CLOCKS Circadian rhythms – daily

cycles of ~ 24 hours Pineal gland regulation –

releases melatonin Suprachiasmatic Nucleus

(SCN) acts as a biological clock Found in the hypothalamus Just above the optic chiasm Receives info from the retina

Retinohypothalamic pathway

GABA released from the hypothalamus shuts down arousal systems

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RETICULAR ACTIVATING SYSTEM

RAS is responsible for sleep/wake behavior and arousal

Sensory systems RAS Cortex

Cortex can stimulate RAS suggesting wakefulness can be consciously maintained

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ANATOMY OF DREAMING During REM Sleep

ACTIVEReticular formationThalamusHypothalamusAmygdala & HippocampusVisual Cortex

INACTIVEParietal CortexPrefrontal Cortex

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SLEEP IN ANIMALS

Sleep is risky! Why is sleep

important? Adaptation

Energy conservation Predator vs. prey

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WHAT DOES SLEEP DO FOR US? Restoration and repair, maintaining

homeostasisSleep deprivation studies show poor

cognition and physiological consequences MEMORY!!!

Activation during REM sleep

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Sleep and sleep disorders

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