A quantitative ultrastructural study of the pinealocyte of the chipmunk (Tamias striatus) during the daytime and at night

Michal Karasek, Thomas S. King, John T. Hansen, Russel J. Reiter

Research output: Contribution to journalArticle

5 Scopus citations


Day‐night differences in the areas of granular endoplasmic reticulum, Golgi apparatus, dense‐core vesicles, and lysosomelike bodies were analyzed morphometrically in the pinealocytes of the chipmunk. The area of lysosomelike bodies was greater at night and lower during the daytime. In contrast, the areas of granular endoplasmic reticulum and dense‐core vesicles were greater during daytime and lower at night. Our observations suggest the existence of 24‐hour rhythms in the areas of these structures, perhaps indicative of a pineal rhythm in secretion, whether indolic or peptidergic.

Original languageEnglish (US)
Pages (from-to)397-401
Number of pages5
JournalJournal of Neuroscience Research
Issue number4
StatePublished - 1982



  • chipmunk
  • pinealocyte
  • ultrastructural morphometrics

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

Cite this