Biomechanics of the Gastrointestinal Tract: New Perspectives by Hans Gregersen MD, DrMSci, MPM (auth.) PDF

By Hans Gregersen MD, DrMSci, MPM (auth.)

ISBN-10: 1447137426

ISBN-13: 9781447137429

ISBN-10: 1849968802

ISBN-13: 9781849968805

Biomechanics of the Gastrointestinal Tract is an updated publication for researchers at the learn of the mechanical homes and the motor procedure of the gastrointestinal tract. A well-illustrated e-book, it presents a accomplished review to appropriate tissue geometry, morphology and biomechanical thought. Separate chapters hide tender muscle and nerve functionality together with the applying to animal and human reports of motility, indicators and soreness, decision of the genuine resting kingdom, history-dependent houses, and tissue remodelling in sickness. numerous equipment and diagnostic functions reminiscent of choice of in vivo length-tension diagrams and multimodal discomfort checking out are thoroughly new yet will certainly be utilized by many sooner or later. New non-invasive imaging thoughts according to ultrasound, MR- and CT-scanning together with balloon distension are rising because the ideas for destiny in vivo studies.

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Extra resources for Biomechanics of the Gastrointestinal Tract: New Perspectives in Motility Research and Diagnostics

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5). 5). Most of the space in the submucosa is occupied by water. Both the thickness and the structural laxity of this lamina allow the mucosa to move freely and widely over the inner surface of the muscle coat. The submucosa also contains a network of nerves called the submucosal plexus. The submucosa has been called the skeleton of the intestine due to its high content of collagen. Both Fackler et al. (1981) and Orberg et al. (1982; 1983) have demonstrated that the collagen fibres in the submucosa of the rat intestine, when exposed to stress, biaxially orient at approximately -30 and +30 to the longitudinal axis.

The Stomaeh and Pyloric Sphineter The gastric myenteric plexus lies only beneath the longitudinal muscle layer. There is none between the circular and oblique musc1e layers. The plexus consists of large ganglia connected by thick fascicles to form a very irregular pattern of polygons. Thick fascicles, extensions of the vagal innervation, ramify in the plane of the myenteric plexus distributing nerve fibres of extrinsic origin especially to the proximal stornach, sparing the antrum. The distribution density of nerve cells in the myenteric plexus rises somewhat from the proximal stornach to the pylorus.

In addition, sensory nerve fibres end in muscle spindies, mechanoreceptors, that appear to be identical to those found in somatic muscle. The Oesophagus and the Lower Oesophageal Sphineter The myenteric plexus of the oesophagus differs from the general pattern with its relatively few ganglia and in its lack of a regular polygonal pattern. This plexus can be seen even in the striated muscle part of the organ where it seems likely to serve mainly mucosal functions. The interganglionic bundles ofaxons extend mainly in the direction of the axis of the organ, and there are many large nerve bundles, branches from the extrinsic innervation - the vagus nerves - running through the plexus parallel to the axis of the organ.

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Biomechanics of the Gastrointestinal Tract: New Perspectives in Motility Research and Diagnostics by Hans Gregersen MD, DrMSci, MPM (auth.)


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