Daily activity of the rabbit jaw muscles during early postnatal development

Neuroscience
T van WesselT M G J van Eijden

Abstract

Early postnatal development of the jaw muscles is characterized by the transition from suckling to chewing behavior. As chewing develops the jaw closing muscles become more powerful compared with the jaw openers. These changes are likely to affect the amount of daily muscle activity. Therefore, the purpose of this study was to characterize for a jaw opener (digastric) and jaw closer (masseter) the total duration of daily muscle activity (i.e. the duty time), and the daily burst numbers and lengths during early postnatal development. Using radiotelemetry the activity of these muscles was recorded in 10 young New Zealand White rabbits between three and eight weeks of age. Fiber-type composition was analyzed at eight weeks of age by determining the myosin heavy chain content of the fibers. During postnatal development both muscles showed no significant decrease or increase in their daily activity. However, the interindividual variation of the duty time and burst number significantly decreased. There were no significant differences between the digastric and masseter except for the most powerful activities at eight weeks of age, where the masseter showed a significantly higher duty time and burst number than the digastric. The masse...Continue Reading

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Citations

Aug 15, 2014·Journal of the Royal Society, Interface·Peter J WatsonMichael J Fagan
May 25, 2007·Annals of Biomedical Engineering·Eiji TanakaTheo M G J van Eijden
Dec 20, 2007·Cells, Tissues, Organs·G E J LangenbachT M G J van Eijden
Jun 28, 2011·Integrative and Comparative Biology·Geerling E J Langenbach
Apr 16, 2011·Journal of Anatomy·W C de JongG E J Langenbach
Feb 16, 2010·The Journal of Experimental Biology·T GrünheidG E J Langenbach

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