Both roots of the olivo-cochlear nerve bundle to one ear were transected in the brain stems of 12 chinchillas. The animals were sacrificed at times ranging from 2 to 35 days after surgery. The normal olivo-cochlear terminals on the external hair cells in the cochleas of the control ears contained many mitochondria and small vesicles of constant size. The earliest evidence for degeneration was the presence of fine 100 A filaments in the proximal parts of the terminals. These were visible at 2 days. Animals sacrificed at later times showed a greater number of filaments and fewer vesicles, but few mitochondrial changes. After 1 week, disintegration of the terminals was more prominent. A few terminals showed mitochondrial swelling and lysis of the plasma membrane but few or no filaments within the first week. These latter terminals were interpreted as representing a more rapid process of disintegration than those terminals characterized by numerous filaments and seemingly unchanged mitochondria.
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1 July 1965
Article|
July 01 1965
DEGENERATION IN THE EFFERENT NERVE ENDINGS IN THE COCHLEA AFTER AXONAL SECTION
Catherine A. Smith,
Catherine A. Smith
From the Department of Otolaryngology, Washington University School of Medicine, Saint Louis, Missouri, and the Laboratory of Neuroanatomical Sciences, National Institutes of Health, Bethesda, Maryland
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Grant L. Rasmussen
Grant L. Rasmussen
From the Department of Otolaryngology, Washington University School of Medicine, Saint Louis, Missouri, and the Laboratory of Neuroanatomical Sciences, National Institutes of Health, Bethesda, Maryland
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Catherine A. Smith
From the Department of Otolaryngology, Washington University School of Medicine, Saint Louis, Missouri, and the Laboratory of Neuroanatomical Sciences, National Institutes of Health, Bethesda, Maryland
Grant L. Rasmussen
From the Department of Otolaryngology, Washington University School of Medicine, Saint Louis, Missouri, and the Laboratory of Neuroanatomical Sciences, National Institutes of Health, Bethesda, Maryland
Received:
September 17 1964
Online ISSN: 1540-8140
Print ISSN: 0021-9525
Copyright © 1965 by The Rockefeller University Press
1965
J Cell Biol (1965) 26 (1): 63–77.
Article history
Received:
September 17 1964
Citation
Catherine A. Smith, Grant L. Rasmussen; DEGENERATION IN THE EFFERENT NERVE ENDINGS IN THE COCHLEA AFTER AXONAL SECTION . J Cell Biol 1 July 1965; 26 (1): 63–77. doi: https://doi.org/10.1083/jcb.26.1.63
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