Fig. 2
 Representative photograph of the superior cervical ganglion (SCG). a Normal appearance in the cage-control SCG. b Normal appearance of ganglionic cells in curcumin-treated animals with more cells. c The chronic sleep deprivation (CSD) SCG: A less population of the ganglionic cell as well as the hypertrophied cells (*), increase of perineuronal space (→) could be seen. Also pyknotic cells (→) can be found in the CSD animals (c1). d The SCG in the CSD animals that received curcumin appeared to have remained similar to normal histology. Arrow indicates pyknotic cells