| The states of sleep |
| Michel Jouvet Scientific American (1967) |
| TABLE OF CONTENTS |
| FIGURES |
| Printable version |
Figure 9
CAT'S BRAINSTEM
is the site of the two groups of cells that produce the substances affecting light and paradoxical sleep. The nuclei of raphe (color) secrete serotonin; nerve cells lower down the pons, known as the locus coeruleus (gray), secrete noradrenalin.