Ultrastructure of the pineal gland of the brush mouse (Peromyscus boylei): Influence of long and short photoperiod

M. Karasek, E. W. Jameson, J. T. Hansen, R. J. Reiter

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The ultrastructure of the pineal gland of wild-captured brush mice (Peromyscus boylei) was examined. A homogeneous population of pinealocytes was present in the pineal gland of this species. The Golgi apparatus, granular endoplasmic reticulum, mitochondria, lysosomes, dense-core vesicles, vacuoles containing fluocculent material, clear vesicles, microtubules and glycogen particles were consistent components of the pinealocyte cytoplasm; infrequently-observed organelles included centrioles, "synaptic" ribbons, subsurface cisternae, multivesicular bodies, lipid droplets and annulate lamellae-like structures. Quantitative comparison of pinealocyte ultrastructure revealed larger cross-sectional areas of cytoplasm, nucleus, Golgi apparatus, granular endoplasmic reticulum, mitochondria and vacuoles containing flocculent material as well as higher number of dense-core vesicles in the animals kept in short photoperiod (LD 8:16) as compared to those in animals kept in long photoperiod (LD 16:8). These observations suggest that restricting the amount of light to which animals are exposed activated the pinealocytes of brush mice.

Original languageEnglish (US)
Pages (from-to)293-308
Number of pages16
JournalJournal of Neural Transmission
Issue number4
StatePublished - Dec 1 1983


  • Pineal gland
  • brush mouse
  • photoperiod
  • ultrastructure

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Psychiatry and Mental health
  • Biological Psychiatry


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