By W. R. Hess (auth.), Professor Dr. Konrad Akert (eds.)
The centennial of his birthday (17 March 1881) caused the publi cation of the chosen Works of Walter Rudolf Hess. even supposing English translation of a number of of his monographs have seemed, none of his orig inal papers has ever been released within the English language. in the course of his sci entific profession, Hess made pioneering contributions within the box of hemo dynamics, pyhsiological optics, oculomotor diagnostics, law of cir culation, respiratory and temperature, and at last at the somatomotor, vis ceral, and emotional capabilities of the diencephalon. His innovations drawback ing association and order in body structure and his perspectives at the vital position of the vegetative anxious approach in regulating the task of the principal ner vous method are of significant curiosity to technological know-how and medication and have been in lots of respects a long way just before his time. those ideas proceed a line of notion which was once upheld via such recognized physiologists as Xavier Bichat, Claude Bernard, and Walter B. Cannon. certainly, Walter Rudolf Hess has develop into one of many infrequent figures within the contemporary historical past of body structure keen to hold out an integrative research of physically capabilities and to go looking for the elemental ideas of rules and interplay among regulatory platforms. in truth, he expected such principles in biology as suggestions keep watch over and ser vomechanisms lengthy prior to those notions developed within the box of engineering and electronics.
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This depends for the one part upon the blood flow that irrigates a certain territory of tissue. , its role as a vehicle for the substances that are exchanged, is decisive. Its adequacy may vary according to its composition; we may think, for example, of the dependence of the oxygen capacity upon the absolute hemoglobin content. The central point of the problem concerning the relation between cardiac output and blood viscosity lies in the fact that principally the same substances that are essential constituents of the blood also determine the level of blood viscosity.
F\ ..... - .. ,', ,', .. ~_ ' . . .. f\. • . .. ·1 \ .. I~I . 'I11\" • ,\J ~. It A' IL 'f"\ . ~ .. . \,' .. '-""'.. . . -- ,. -...! :- .... .. c Fig. B. Localization of the blood pressure effects elicited by electrical stimulation. Sagittal plane of the diencephalon projected slightly laterally from the midline. The bow-shaped symbols directed upward correspond to an increase in blood pressure. The insertion of parallel lines means an increase of heart rate.
25 mm, could be inserted into the brain without damaging, to any disturbing extent, the fiber tracts which are of importance for the stimulation experiment. In carrying out the experiments we were not looking for specific effects. Considering the complexity of the diencephalon and the great lack of knowledge about the biological significance of the various areas that it includes, we preferred to follow a systematic scheme by which as many points as possible could be electrically stimulated in the diencephalon.