| Morphological and functional asymmetry of the human recurrent laryngeal nerve. | |
| | |
MedLine Citation:
|
PMID: 23150169 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
PURPOSE: The aim of the current study was to analyze some parameters that are involved in nerve conduction in the right and left recurrent laryngeal nerves (RLNs) in humans. We have studied two morphological parameters such as the length of the two nerves, and the total intraperineural area (TIPA) from necropsies, and one functional parameter such as the latency of the thyroarytenoid muscle from operated patients. METHODS: The morphological parameters of six white female adult cadavers were analyzed. The RLNs were totally removed on both sides with the vagus nerve from their origin to the entrance in the larynx at the cricothyroid joint. The lengths were measured with the help of a digitalized caliper. Selected sections were obtained from each third of the RLNs for histological analysis. The TIPA was estimated at each selected level using digitized images of nerve sections and a manual micrometer. All the measurements were carried out by specialists in histology. The intraoperative vagal nerve stimulations were conducted using the NIM3 Medtronic(®) monitoring system (Medtronic Xomed Inc., Jacksonville, FL, USA) in ten adult patients without laryngeal or nervous disease during thyroid gland surgery. The evocated laryngeal electromyography was performed with the Medtronic bipolar needle electrode directly inserted into the thyroarytenoid muscle. The direct vagal nerve stimulation was achieved with the Medtronic stimulation from 0.5 to 1 mA. The latency of the thyroarytenoid muscle was recorded on the NIM-response monitor. RESULTS: The mean lengths of the left and right RLNs were, respectively, 136.6 and 75.0 mm with a mean difference of 61.6 mm (range 50-75 mm). The quantitative comparison of the TIPA between proximal segments of the left and right RLN showed no significant difference. The distal and proximal TIPA ratio demonstrated differences between the left and right RLN, respectively, 53.76 and 38.88 % without any statistical meaning. The comparison of the TIPA of the distal segments of the RLNs showed no significant difference. The intraoperative vagal nerve stimulation (0.5 and 1 mA) displayed a mean latency of the right and left thyroarytenoid muscle, respectively, of 3.55-3.68 and 5.90-5.98 ms with a mean difference of 2.35-2.30 ms (range 1.75-3.30 ms). CONCLUSION: If length and latency asymmetry of the right and left RLNs in humans can be demonstrated, the synchronicity of the vocal folds requiring precise controlled variations within intrinsic laryngeal muscles needs further investigations. |
| | |
Authors:
|
J M Prades; M D Dubois; J M Dumollard; L Tordella; J Rigail; A P Timoshenko; M Peoc'h |
Related Documents
:
|
19866639 - Contraction in glycerinated myofibrils of an insect (orthoptera, acrididae). 23467369 - Effect of limb lengthening on internodal length and conduction velocity of peripheral n... 12607039 - Octopamine modulates spermathecal muscle contractions in locusta migratoria. 9179669 - Calcium independent contraction of bladder smooth muscle. 9313769 - Comparative analysis of isolated human bronchi contraction and biosynthesis of cysteiny... 23277479 - Effect of muscle length on cross-bridge kinetics in intact cardiac trabeculae at body t... 8513979 - The paradox between resistance to hypoxia and liability to hypoxic damage in hyperglyce... 2851269 - Defects in muscle fiber growth in fatal infantile cytochrome c oxidase deficiency. 17827979 - Delayed evacuatory function due to specific smooth muscle reactivity in the gastrointes... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-7-11 |
Journal Detail:
|
Title: Surgical and radiologic anatomy : SRA Volume: 34 ISSN: 1279-8517 ISO Abbreviation: Surg Radiol Anat Publication Date: 2012 Dec |
Date Detail:
|
Created Date: 2012-11-14 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 8608029 Medline TA: Surg Radiol Anat Country: - |
Other Details:
|
Languages: ENG Pagination: 903-908 Citation Subset: - |
Affiliation:
|
Department of Human Anatomy, University of Saint-Etienne, Saint-Etienne, France, jean.michel.prades@univ-st-etienne.fr. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Weight status, quality of life, and cigarette smoking among adolescents in Washington State.
Next Document: Big Effects of Small RNAs: A Review of MicroRNAs in Anxiety.