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The root of the right subclavian artery . This entity is a single entity and despite its name, has no symmetrical counterpart. It must be clearly distinguished from the subclavian artery, presented as a symmetrical pair. This pair has normally a left and a right member, this last one being the continuation of the present entity.We want to build a formally correct presentation of the partonomy of the human body. To do that we have distinguished four major types of units: the single, the pair, the set and the pset (pair set). Here, in the presentation around the aortic arch, the usual symmetry prevailing largely everywhere in the human body, is in default: the aortic arch is essentially asymmetrical. However, the common carotis artery and the suclavian artery are considered as symmetrical pairs. This is true, at least in a first approximation, as other situations in the body.The presentation is achieved thanks to four single entities, named root, in order to make them distinct from their symmetrical continuations. The limit between these roots and the lateral members of pairs being the continuation is obviously a fiat boundary.
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