The Recurrent Laryngeal Nerve in Spastic Dysphonia: A Light and Electron Microscopic Study

B. Carlsöö Department of Otolaryngology—Head & Neck Surgery and Histology, UmeÅ University Hospital, Umeå, Sweden

K. Izdebski Speech Pathology Service, Veterans Administration Medical Center, Martinez, California, USA

Å. Dahlqvist Department of Otolaryngology—Head & Neck Surgery and Histology, UmeÅ University Hospital, Umeå, Sweden

S. Domeij Department of Otolaryngology—Head & Neck Surgery and Histology, UmeÅ University Hospital, Umeå, Sweden

H. H. Dedo Department of Otolaryngology—Head & Neck Surgery, UCSF, San Francisco, California, USA

Abstract

Sections of right or left recurrent laryngeal nerve (FCN), removed from patients with spastic dysphonia (SD) at the time of surgery, were studied using light and electron microscopy and were compared with control RLNs. In both groups, small, medium and large-sized myelinated nerve fibres were found in the RLN. Furthermore, numerous unmyelinated axons intermingled with the myelinated fibres were detected in the control group as well as in SD specimens. Slight morphometric differences were also found between the two groups, but these cannot explain the causation of spastic dysphonia.

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The Recurrent Laryngeal Nerve in Spastic Dysphonia: A Light and Electron Microscopic Study

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The Recurrent Laryngeal Nerve in Spastic Dysphonia: A Light and Electron Microscopic Study

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