umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Differences in fibre type composition between human masseter and biceps muscles in young and adults reveal unique masseter fibre type growth pattern
Umeå University, Faculty of Medicine, Department of Odontology, Clinical Oral Physiology.
Umeå University, Faculty of Medicine, Department of Integrative Medical Biology (IMB), Anatomy.
Umeå University, Faculty of Medicine, Department of Odontology.
2011 (English)In: Anatomical Record, ISSN 0003-276X, E-ISSN 1097-0185, Vol. 294, no 7, 1158-1169 p.Article in journal (Refereed) Published
Abstract [en]

The human jaw system is different from those of other primates, carnivores, ruminants, and rodents in temporomandibular joint and muscle anatomy. In adults, jaw muscles also differ markedly from limb and trunk muscles in composition and distribution of fibre types. It can be assumed that age-related changes between young age to adulthood in terms of craniofacial growth, teeth eruption, and improvement of jaw functions are paralleled by alterations also in composition and distribution of jaw muscle fibre types. To address this question, we have examined the fibre type composition of the human masseter, a jaw closing muscle, at young age. For comparison, the young biceps brachii was examined. The results were compared with previous data for adult masseter and biceps muscles. Young masseter and biceps were similar in that type I fibres outnumbered other fibre types and were of the same diameter. However, they differed in composition of other fibre types. Young masseter contained fibre types I, IM, IIC, IIAB, IIB, and scarce IIA, with regional differences, whereas young biceps showed types I, IIA, IIAB, and few IIB. Young masseter differed from young biceps also by smaller type II fibre diameter and by containing fetal MyHC. In addition, the masseter and biceps differed in age-related changes of composition and distribution of fibre types between young age and adulthood. We conclude that the human masseter is specialized in fibre types already at young age and shows a unique fibre type growth pattern, in concordance with being a separate allotype of muscle.

Place, publisher, year, edition, pages
Wiley-Liss, Inc. , 2011. Vol. 294, no 7, 1158-1169 p.
Keyword [en]
enzyme- and immuno-histochemistry, fibre types, jaw, limb, morphology, myosin heavy chain
National Category
Dentistry
Research subject
Human Anatomy
Identifiers
URN: urn:nbn:se:umu:diva-46418DOI: 10.1002/ar.21272OAI: oai:DiVA.org:umu-46418DiVA: diva2:438271
Available from: 2011-09-01 Created: 2011-09-01 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Extra- and intrafusal muscle fibre type compositions of the human masseter at young age.: In perspective of growth and functional maturation of the jaw-face motor system.
Open this publication in new window or tab >>Extra- and intrafusal muscle fibre type compositions of the human masseter at young age.: In perspective of growth and functional maturation of the jaw-face motor system.
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Muscles control body posture and movement by extrafusal and intrafusal (muscle spindle) fibres. The purpose of this thesis was to provide insight into the muscular basis for human jaw function at young age. Extrafusal and intrafusal fibres in the young masseter, and for comparison young biceps, were examined for composition of fibre types and myosin heavy chain (MyHC) isoforms by means of morphological, enzyme-histochemical, biochemical and immuno-histochemical techniques. For evaluation of plasticity during life span the data for young muscles were compared with previous reported data for adult and elderly muscles.

The results showed significant differences in extrafusal fibre types and MyHC expression between young masseter and young biceps and between young masseter and masseter in adults and elderly. Compared with young biceps, young masseter was more intricate in composition of extrafusal MyHC expression. Muscle spindles were larger and more frequent in the masseter than in the biceps. Masseter and biceps muscle spindles showed fundamental similarities but also marked differences in MyHC expression.

The results suggest that the young masseter is specialized in fibre types already at young age and shows a unique fibre type growth pattern. Whereas masseter extrafusal fibres display marked plasticity in fibre types and MyHC isoforms during life span muscle spindles/intrafusal fibres are morphologically mature already at young age and precede extrafusal fibres in growth and maturation. Results showed similarities in intrafusal MyHC expression between young masseter and biceps, but also differences implying muscle specific proprioceptive control. Differences in fibre types and MyHC expression between young masseter and young biceps extrafusal fibres are proposed to reflect diverse evolutionary and developmental origins and accord with the masseter and biceps being separate allotypes of muscle.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2011. 76 p.
Series
Umeå University odontological dissertations, ISSN 0345-7532 ; 120
Keyword
jaw, limb, human, muscle, morphology, fibre type, myosin heavy chain, muscle spindle
National Category
Dentistry
Research subject
Human Anatomy
Identifiers
urn:nbn:se:umu:diva-46667 (URN)978-91-7459-285-6 (ISBN)
Public defence
2011-09-30, Tandläkarhögskolan, byggnad 1D, 9 tr., sal B, Umeå universitet, Umeå, 09:00 (Swedish)
Opponent
Supervisors
Available from: 2011-09-09 Created: 2011-09-09 Last updated: 2012-11-09Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Österlund, CatharinaThornell, Lars-EricEriksson, Per-Olof
By organisation
Clinical Oral PhysiologyAnatomyDepartment of Odontology
In the same journal
Anatomical Record
Dentistry

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 372 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf