In the development of the arterial system, the primary network of vessels is the first to appear. Conditions for the circulation of blood are more difficult in the peripheral parts of this network than in areas where the organ and the maternal trunk are connected by a shorter route. This is why a certain vessel lying along a straight line between the maternal trunk and the organ is retained, while others fall out of use.The structure of the arterial system develops according to the same general laws of structure and development as theMedical Coding Services will help in these for collections.
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