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Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles

Although the occurrence of muscle spindles (MS) is quite high in most skeletal muscles of humans, few MS, or even absence, have been reported in digastric and mylohyoideus muscles. Even if this condition is generally accepted and quoted in many papers and books, observational studies are scarce and...

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Autores principales: Saverino, Daniele, De Santanna, Amleto, Simone, Rita, Cervioni, Stefano, Cattrysse, Erik, Testa, Marco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4140126/
https://www.ncbi.nlm.nih.gov/pubmed/25165696
http://dx.doi.org/10.1155/2014/294263
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author Saverino, Daniele
De Santanna, Amleto
Simone, Rita
Cervioni, Stefano
Cattrysse, Erik
Testa, Marco
author_facet Saverino, Daniele
De Santanna, Amleto
Simone, Rita
Cervioni, Stefano
Cattrysse, Erik
Testa, Marco
author_sort Saverino, Daniele
collection PubMed
description Although the occurrence of muscle spindles (MS) is quite high in most skeletal muscles of humans, few MS, or even absence, have been reported in digastric and mylohyoideus muscles. Even if this condition is generally accepted and quoted in many papers and books, observational studies are scarce and based on histological sections of a low number of specimens. The aim of the present study is to confirm previous data, assessing MS number in a sample of digastric and mylohyoideus muscles. We investigated 11 digastric and 6 mylohyoideus muscles from 13 donors. Muscle samples were embedded in paraffin wax, cross-sectioned in a rostrocaudal direction, and stained using haematoxylin-eosin. A mean of 5.1 ± 1.1 (range 3–7) MS was found in digastric muscles and mean of 0.5 ± 0.8 (range 0–2) in mylohyoideus muscles. A significant difference (P < 0.001) was found with the control sample, confirming the correctness of the histological procedure. Our results support general belief that the absolute number of spindles is sparse in digastric and mylohyoideus muscles. External forces, such as food resistance during chewing or gravity, do not counteract jaw-opening muscles. It is conceivable that this condition gives them a limited proprioceptive importance and a reduced need for having specific receptors as MS.
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spelling pubmed-41401262014-08-27 Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles Saverino, Daniele De Santanna, Amleto Simone, Rita Cervioni, Stefano Cattrysse, Erik Testa, Marco Biomed Res Int Research Article Although the occurrence of muscle spindles (MS) is quite high in most skeletal muscles of humans, few MS, or even absence, have been reported in digastric and mylohyoideus muscles. Even if this condition is generally accepted and quoted in many papers and books, observational studies are scarce and based on histological sections of a low number of specimens. The aim of the present study is to confirm previous data, assessing MS number in a sample of digastric and mylohyoideus muscles. We investigated 11 digastric and 6 mylohyoideus muscles from 13 donors. Muscle samples were embedded in paraffin wax, cross-sectioned in a rostrocaudal direction, and stained using haematoxylin-eosin. A mean of 5.1 ± 1.1 (range 3–7) MS was found in digastric muscles and mean of 0.5 ± 0.8 (range 0–2) in mylohyoideus muscles. A significant difference (P < 0.001) was found with the control sample, confirming the correctness of the histological procedure. Our results support general belief that the absolute number of spindles is sparse in digastric and mylohyoideus muscles. External forces, such as food resistance during chewing or gravity, do not counteract jaw-opening muscles. It is conceivable that this condition gives them a limited proprioceptive importance and a reduced need for having specific receptors as MS. Hindawi Publishing Corporation 2014 2014-07-16 /pmc/articles/PMC4140126/ /pubmed/25165696 http://dx.doi.org/10.1155/2014/294263 Text en Copyright © 2014 Daniele Saverino et al. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Saverino, Daniele
De Santanna, Amleto
Simone, Rita
Cervioni, Stefano
Cattrysse, Erik
Testa, Marco
Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles
title Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles
title_full Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles
title_fullStr Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles
title_full_unstemmed Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles
title_short Observational Study on the Occurrence of Muscle Spindles in Human Digastric and Mylohyoideus Muscles
title_sort observational study on the occurrence of muscle spindles in human digastric and mylohyoideus muscles
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4140126/
https://www.ncbi.nlm.nih.gov/pubmed/25165696
http://dx.doi.org/10.1155/2014/294263
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