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Vestibular sympathetic nervous system in guinea pig
K Hozawa1, T Takasaka, R S Kimura
1Department of Otolaryngology, Tohoku University School of Medicine, Sendai, Japan.
Acta Oto-Laryngologica. Supplementum
|January 1, 1991
Summary
Sympathetic nerve fibers innervate the vestibular labyrinth in guinea pigs, originating from the superior cervical ganglion. These vestibular sympathetic fibers interact with Scarpa
Area of Science:
- Neuroscience
- Anatomy
- Otolaryngology
Background:
- The sympathetic nervous system's role in vestibular function is not fully understood.
- Previous research has not comprehensively mapped vestibular sympathetic innervation.
Purpose of the Study:
- To investigate the origin, distribution, and termination of sympathetic nerve fibers within the vestibular system of guinea pigs.
Main Methods:
- Immunohistochemistry using tyrosine hydroxylase and dopamine beta-hydroxylase.
- Analysis of vestibular sympathetic pathways in 20 guinea pigs.
Main Results:
- Sympathetic fibers originate from the superior cervical ganglion and enter the internal auditory meatus.
- Fibers innervate Scarpa's ganglion, vestibular nerves, crista ampullaris, and otoconial maculae.
- Sympathetic fibers contact vestibular afferent and efferent fibers but not sensory epithelia.
Conclusions:
- Sympathetic innervation is widespread within the vestibular labyrinth, suggesting a modulatory role.
- These findings provide a detailed anatomical basis for understanding sympathetic influence on vestibular function.