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Development of the otolith organs and semicircular canals in the Japanese red-bellied newt, Cynops pyrrhogasterThe 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.
Document ID
20050000210
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wiederhold, M. L.
(University of Texas Health Science Center at San Antonio 78284-7777 United States)
Yamashita, M.
Larsen, K. A.
Batten, J. S.
Koike, H.
Asashima, M.
Date Acquired
August 22, 2013
Publication Date
April 1, 1995
Publication Information
Publication: Hearing research
Volume: 84
Issue: 1-2
ISSN: 0378-5955
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Neuroscience
Non-NASA Center

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