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Cell and Tissue Research

, Volume 266, Issue 1, pp 107–116 | Cite as

Distribution of 5-HT (serotonin) immunoreactivity in the central nervous system of the inshore hagfish,Eptatretus burgeri

  • Tetsuo Kadota
Article

Summary

Immunohistochemical techniques were used to study the distribution of serotonin in the central nervous system of the hagfish,Eptatretus burgeri, in order to produce a detailed map of serotonin-containing structures. In the hypothalamus, many serotonin-containing neurons contacted the cerebrospinal fluid. Most of the serotonin-containing cell bodies were located in the raphe region, where they were compactly distributed at the level of the nucleus motorius tegmenti pars anterior but more diffusely distributed at the level of the nucleus motorius tegmenti pars posterior. Serotonin-containing cell bodies and varicose fibers were widely distributed throughout the brain and upper spinal cord segments, but the distribution density was not even. On the basis of its abundance, serotonin can be judged to have an important function in the control of the hagfish central nervous system. From a phylogenetic point of view, serotonin-containing neurons in the raphe region appear to be a common property of all classes of vertebrates studied except the lampreys, whereas serotonin-containing cerebrospinal fluid-contacting neurons may be considered to be a primitive condition in all nonmammalian vertebrates.

Key words

Serotonin Immunohistochemistry CSF-contacting neurons Raphe Hagfish (Eptatretus burgeri

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Tetsuo Kadota
    • 1
  1. 1.Department of AnatomyYokohama City University School of MedicineYokohamaJapan

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