The integration of the cerebral and coronary circulations with the dynamic system structure of brain and myocardium and the form of the cerebral and coronary artery trees.
Cerebral and coronary arterial trees lack functional anastomoses and are 'non-redundant' in the number of arteries. These two morphological characteristics expose brain and myocardium to vascular pathologies. An elementary model common to the cerebral and myocardial blood supply permits an explanation of the two characteristics. On the ground of this model the brain and the myocardium are represented as dynamic systems--organ-systems--made up of units, these corresponding to neurons and to cardiac cells. A flow of information between the units determines variations of state of the units. The whole of the variations of state of the units gives the organ-system function. The artery tree is considered as an information channel--tree-channel--that conveys information to the units. This artery-transmitted information determines the way the units function. The tree-channel always emits the same message. Therefore the artery-transmitted information does not cause local or temporal variations in the functioning of the units. On the contrary, if the tree-channel is noised the ending branches will emit randomly varied messages. Such random emission--disorder--will cause random loco-temporal variations in the functioning of the units. Consequently the functioning of the organ-system will be disturbed. It is shown that a low number of branches lowers the quantity of disorder that a noised tree-channel can emit. The absence of anastomoses avoids combinatory phenomena between the diverse messages that would increase the disorder. Biological and pathological evidence supports the model and the explanation.
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D000818:Animals; D002536:Cerebral Arteries / Q000033:anatomy & histology* / Q000502:physiology; D002560:Cerebrovascular Circulation / Q000502:physiology; D003326:Coronary Circulation / Q000502:physiology; D003331:Coronary Vessels / Q000033:anatomy & histology* / Q000502:physiology; D006801:Humans; D008953:Models, Anatomic