Sleep anatomy etc.

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Sleep anatomy etc.

  1. 1. SLEEP
  2. 2. 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
  3. 3. 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
  4. 4. ANATOMY OF DREAMING During REM Sleep  ACTIVE  INACTIVE  Reticular formation  Parietal Cortex  Thalamus  Prefrontal Cortex  Hypothalamus  Amygdala & Hippocampus  Visual Cortex
  5. 5. SLEEP IN ANIMALS  Sleep is risky!  Why is sleep important?  Adaptation  Energy conservation  Predator vs. prey
  6. 6. WHAT DOES SLEEP DO FOR US? Restoration and repair, maintaining homeostasis  Sleep deprivation studies show poor cognition and physiological consequences MEMORY!!!  Activation during REM sleep

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