Ultrastructure of the myotendinous junction of the medial pterygoid muscle of adult and aged Wistar rats

Micron : the International Research and Review Journal for Microscopy
Adriano CienaI Watanabe

Abstract

The myotendon junction (MTJ) is a specialised area into the muscle fibers where the sarcoplasmic membranes connect to the collagen fibers bundles. There are few data about plasticity of the MTJ in aging processes. The aim of this study is to analyse the ultrastructure characteristics of MTJ of medial pterygoid muscle of adult and aged rats. Employing the transmission electron microscopy method, twenty male rats Wistar (Rattus norvegicus) were divided into two groups: A (n=10) with 12 months of age; B (n=10) 24 months of age. The animals were anaesthetised with overdose the urethane (3g/kg, i.p.) and sacrified during the perfusion with modified Karnovsky solution. The specimens were post-fixed in a 1% osmium tetroxide solution, dehydrated in ascending concentration of ethanol and embedded in Spurr resin. The thin sections, of 90 nm thick, were counterstained with uranyl acetate and lead citrate solution, and examined in a Jeol 1010 transmission electron microscope. The fine structure of the MTJ of group A revealed the defined interdigitations and disposed in several levels of deep formations containing the collagen fibers. In the group B, such structures did not observed, detecting the projections irregular in shape, and large o...Continue Reading

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Citations

Oct 5, 2011·Micron : the International Research and Review Journal for Microscopy·Adriano Polican CienaIi-sei Watanabe
May 25, 2013·Journal of Anatomy·Adriano Polican CienaIi-sei Watanabe
Apr 24, 2012·Microscopy Research and Technique·Adriano Polican CienaIi-sei Watanabe
Apr 11, 2014·Scandinavian Journal of Medicine & Science in Sports·A B KnudsenM R Krogsgaard
Apr 29, 2016·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Cristiano Pedrozo VieiraEdson Rosa Pimentel
May 12, 2020·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·Paolo MinafraGianni Mazzoni
Apr 25, 2018·Microscopy Research and Technique·Luan Rissatto SierraAdriano Polican Ciena
Jan 10, 2020·Anatomical Science International·Masahito Yamamoto, Shinichi Abe
Aug 26, 2020·Scientific Reports·Jurandyr Pimentel NetoAdriano Polican Ciena
Mar 1, 2021·Journal of Anatomy·Christian Albrecht May, Silvia Bramke
Apr 22, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Bruna Aléxia Cristofoletti GrilloAdriano P Ciena
Jul 3, 2021·International Journal of Molecular Sciences·Lara Caetano RochaAdriano Polican Ciena

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