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The reticulum is the first chamber in the alimentary canal of a ruminant animal. Anatomically it is considered the smaller portion of the reticulorumen along with the rumen. Together these two compartments make up 84% of the volume of the total stomach. The rumen is located at the base of the esophagus. The reticulum is colloquially referred to as the ''honeycomb''. It is also known as the bonnet〔(The Chambers Dictionary, Ninth Edition, Chambers Harrap Publishers, 2003 )〕 and as the kings-hood.〔 When cleaned and used for food, it is called "tripe". Heavy or dense feed and foreign objects will settle here. It is the site of hardware disease in cattle and because of the proximity to the heart this disease can be life-threatening. == Anatomy == The internal mucosa has a honeycomb shape. When looking at the reticulum with ultrasonography it is a crescent shaped structure with a smooth contour.〔(U., and D. Jacquat. 2011. Ultrasonography of the reticulum in 30 healthy Saanen goats. Acta Veterinaria Scandinavica 53:19 )〕 The reticulum is adjacent to the diaphragm, lungs, abomasum, rumen and liver. The heights of the reticular crests and depth of the structures vary across ruminant animal species.〔(M., Hofmann, R. R., Streich, W. J., Fickel, J., and Hummel, J. 2009. Convergence in the macroscopic anatomy of the reticulum in wild ruminant species of different feeding types and a new resulting hypothesis on reticular function. Journal of Zoology. 281:26-38. )〕 Grazing ruminants have higher crests than browsers. However, general reticulum size is fairly constant across ruminants of differing body size and feeding type. In a mature cow, the reticulum can hold around 5 gallons of liquid. The rumen and reticulum are very close in structure and function and can be considered as one organ. They are separated only by a muscular fold of tissue. In immature ruminants a reticular groove is formed by the muscular fold of the reticulum. This allows milk to pass by the reticulorumen straight into the abomasum. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Reticulum (anatomy)」の詳細全文を読む スポンサード リンク
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