Evaluation of Yanagihara facial nerve grading system based on a muscle fiber analysis of human facial muscles.
Facial muscle
Morphometry
Muscle fiber
Yanagihara facial nerve grading system
Journal
European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
ISSN: 1434-4726
Titre abrégé: Eur Arch Otorhinolaryngol
Pays: Germany
ID NLM: 9002937
Informations de publication
Date de publication:
Jul 2019
Jul 2019
Historique:
received:
12
02
2019
accepted:
03
05
2019
pubmed:
12
5
2019
medline:
6
8
2019
entrez:
12
5
2019
Statut:
ppublish
Résumé
We morphometrically analyzed human facial muscles, and evaluated the Yanagihara facial nerve grading system using our data. We used 15 types of human facial muscle, 2 types of masticatory muscle and 2 types of skeletal muscle. The materials were obtained from 11 Japanese male cadavers aged 43-86 years. We counted the muscle fibers and measured the transverse area of the muscle fibers (TAMF), and then calculated the number of muscle fibers (NMF) per mm We found a significant correlation between average TAMF and NMF (r = - 0.70; p < 0.01). We classified facial muscles into three types based on the correlational results. Type A had a low average TAMF and high NMF. Type C had a high average TAMF and low NMF. Masticatory and skeletal muscles were characterized as Type C. Type B was intermediate between Types A and C. Pathological changes in the facial muscles in facial nerve palsy seem to vary according to the type of facial muscle, because each facial muscle has a unique fiber-type composition. As the nine discrete facial expressive states evaluated in the Yanagihara system involve all three facial muscle types of our classification, the Yanagihara system is an outstanding system for grading facial nerve palsy in terms of the facial muscle morphology.
Identifiants
pubmed: 31076880
doi: 10.1007/s00405-019-05462-0
pii: 10.1007/s00405-019-05462-0
pmc: PMC6581922
doi:
Types de publication
Journal Article
Langues
eng
Pagination
2055-2060Subventions
Organisme : Grant-in-aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan
ID : B14370007
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