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Hair cell innervation by spiral ganglion neurons in the mouse
Abstract
Horseradish peroxidase (HRP) was injected extracellularly into the auditory nerve of adult mice so that the enzyme could infuse individual spiral ganglion neurons. Forty-two well-stained neurons were reconstructed through serial sections from their cell bodies to peripheral terminations in the organ of Corti with the aid of a light microscope and drawing tube. No neuron was observed to innervate both inner and outer hair cells (IHCs and OHCs). Previous observations from neonatal mammals that reported that IHCs and OHCs were innervated by the same neuron are thus presumed to describe a transient developmental phenomenon. Two populations of spiral ganglion neurons were determined on the basis of the differences in receptor innervation. The type I neurons innervated exclusively IHCs by way of thick (1-2 microns) radial fibers, whereas the type II neurons innervated only OHCs by way of thin (approximately 0.5 micron) outer spiral fibers. Certain features of the peripheral process in the vicinity of the cell body were highly correlated with fiber type. This pattern of separate innervation of IHCs and OHCs by type I and type II neurons, respectively, may represent the general plan of afferent organization for the adult mammalian cochlea.
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“Type II cochlear afferents have small caliber, unmyelinated processes that extend hundreds of microns toward the cochlear base, contacting dozens of outer hair cells enroute (27–29).”
From Damage-evoked signals in cochlear neurons and supporting cells (2024) · cites this paper as [28]
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Prior acoustic trauma alters type II afferent activity in the mouse cochlea
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“Putative role of type II afferents in pathologic hearing Hearing loss subsequent to acoustic trauma is correlated with increased synaptic ribbons in the OHCs, predicting a functionally significant increase in the number of type II afferent action potentials (Wood et al., 2021).”
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Metadata
- Authors
- Berglund, A. M., & Ryugo, D. K.
- Affiliations
- Massachusetts Eye and Ear Infirmary (US)
- ORCID
- Ryugo, D. K.
- Venue
- Journal of Comparative Neurology
- Publisher
- Wiley
- Published
- 1987-01-22
- Volume
- 255
- Issue
- 4
- Pages
- 560-570
- ISSN
- 0021-9967 (ISSN-L)
- 1096-9861
- OpenAlex
- W2119585553
- Cited by
- 172
- References
- 34
- Citations by year
- 2026: 6 · 2025: 2 · 2024: 4 · 2023: 1 · 2022: 6 · 2021: 9 · 2020: 8 · 2019: 3 · 2018: 7 · 2016: 7 · 2015: 10 · 2014: 3 · 2013: 1 · 2012: 9
- FWCI
- 3.33
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Comparative Neurology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of General Medical Sciences (GM-07258)
- National Institute of Neurological Disorders and Stroke (NS 20156, NS 13126)
- Topics
- Life Sciences › Neuroscience › Sensory Systems › Hearing, Cochlea, Tinnitus, Genetics
- Life Sciences › Neuroscience › Neurology › Vestibular and auditory disorders
- Health Sciences › Health Professions › Speech and Hearing › Hearing Loss and Rehabilitation
- Keywords
- spiral ganglion neurons, inner hair cells, outer hair cells, auditory nerve, radial fibers, hair cell innervation, mouse cochlea
- MeSH terms
- Animals, Ganglia, Hair Cells, Auditory, Male, Medical Illustration, Mice, Inbred Strains, Neurons, Mice
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