Development of the otolith organs and semicircular canals in the Japanese red-bellied newt, Cynops pyrrhogaster

Michael L. Wiederhold, Masamichi Yamashita, Kristin A. Larsen, Jeffrey S. Batten, Hajime Koike, Makoto Asashima

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The sequence in which the otoliths and semicircular canals and their associated sensory epithelia appear and develop in the newt are described. Three-dimensional reconstruction of serial sections through the otic vesicle of newt embryos from stages 31 through 58 demonstrate the first appearance, relative position and growth of the otoliths. A single otolith is first seen in stage 33 embryos (approximately 9 days old); this splits into separate utricular and saccular otoliths at stage 40 (13 days). The lateral semicircular canal is the first to appear, at stage 41 (14 days). The anterior and posterior canals appear approximately one week later and the vestibular apparatus is essentially fully formed at stage 58 (approximately 5 weeks). The data reported here will serve as ground-based controls for fertilized newt eggs flown on the International Microgravity Laboratory-2 Space Shuttle flight, to investigate the influence of microgravity on the development of the gravity-sensing organs.

Original languageEnglish (US)
Pages (from-to)41-51
Number of pages11
JournalHearing Research
Volume84
Issue number1-2
DOIs
StatePublished - Apr 1995

Keywords

  • Development
  • Otoconia
  • Otolith
  • Saccule
  • Semicircular canals
  • Utricle

ASJC Scopus subject areas

  • Sensory Systems

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