Muscle fiber architecture of the dog diaphragm

Journal of Applied Physiology
A M BoriekJ R Rodarte

Abstract

Previous measurements of muscle thickness and length ratio of costal diaphragm insertions in the dog (A. M. Boriek and J. R. Rodarte. J. Appl. Physiol. 77: 2065-2070, 1994) suggested, but did not prove, discontinuous muscle fiber architecture. We examined diaphragmatic muscle fiber architecture using morphological and histochemical methods. In 15 mongrel dogs, transverse sections along the length of the muscle fibers were analyzed morphometrically at x20, by using the BioQuant System IV software. We measured fiber diameters, cross-sectional fiber shapes, and cross-sectional area distributions of fibers. We also determined numbers of muscle fibers per cross-sectional area and ratio of connective tissue to muscle fibers along a course of the muscle from near the chest wall (CW) to near the central tendon (CT) for midcostal left and right hemidiaphragms, as well as ventral, middle, and dorsal regions of the left costal hemidiaphragm. In six other mongrel dogs, the macroscopic distribution of neuromuscular junctions (NMJ) on thoracic and abdominal diaphragm surfaces was determined by staining the intact diaphragmatic muscle for acetylcholinesterase activity. The average major diameter of muscle fibers was significantly smaller, and...Continue Reading

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Citations

Aug 16, 2005·Journal of Applied Physiology·Stephen J Lai-FookPhilip D Jones
Oct 8, 2017·Journal of Muscle Research and Cell Motility·Patricia S PardoAladin M Boriek
May 6, 2010·FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology·Junaith S MohamedAladin M Boriek
Dec 22, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·A M BoriekJ R Rodarte
Dec 21, 2000·American Journal of Physiology. Cell Physiology·A M BoriekJ G Tidball
Oct 9, 2003·The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology·Ronald E BremerKarl B Thor
Jan 18, 2002·Journal of Applied Physiology·Aladin M BoriekDeshen Zhu
May 24, 2005·Neuromuscular Disorders : NMD·Stefan MateckiMichele Ramonatxo

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