Early Development of Oral, Olfactory and Adenohypophyseal Structures of Agnathans and Its Evolutionary Implications

  • Aubrey Gorbman
  • Arnold Tamarin
Part of the NATO ASI Series book series (NSSA, volume 103)


Ideas concerning the earliest evolution of the vertebrate head must be based on paleontological evidence as well as on adult and embryonic morphology of present day agnathans. Unfortunately, paleontological evidence for evolution of certain soft structures of the head is not really available, so that embryonic development of such structures is often the basis for speculation in this field (e.g. Stensiö, 1968). Here, we would like to address one phase of this problem; the formation of the agnathan adenohypophysis and some contiguous structures from the nasopharyngeal canal, and the presumed homology of the nasopharyngeal canal with the adenohypophyseal anlage, or Rathke’s pouch, of higher vertebrates.


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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Aubrey Gorbman
    • 1
  • Arnold Tamarin
    • 2
    • 3
  1. 1.Department of ZoologyUniversity of WashingtonSeattleUSA
  2. 2.Department of Biological StructureUniversity of WashingtonSeattleUSA
  3. 3.Department of Oral BiologyUniversity of WashingtonSeattleUSA

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