Can pain induce sleep

 
 

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Fig. 8.1: The most important brain regions. Longitudinal section through the human brain. (22k JPG file)

 

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Fig. 8.2: Blocking of the enzyme tryptophan hydroxylase by PCPA. The neurotransmitter serotonin is formed from the dietary amino acid tryptophan. The enzyme tryptophan hydroxylase is required to convert tryptophan into the serotonin precursor 5-hydroxytryptophan. If this enzyme is blocked by the inhibitor parachlorophenylalanine (PCPA), serotonin can no longer be produced. (22k JPG file)

 

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Fig. 8.3: A cat "lives out its REM sleep". After certain nerve cells in the brain stem have been switched off, the inhibition of muscle activity during REM sleep disappears. The sleeping cat lifts its head, stands up, moves and appears to attack non-existent objects. (Based on a film sequence by Morrison, 1983.) (29k JPG file)

 

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