Georg Prochaska

Georg Prochaska (April 10, 1749 in Blížkovice near Mahrisch Budwitz – July 17, 1820 in Vienna) (first name sometimes referred to as Juri, Jiří or Georgius) (Czech: Jiří Procháska) was a leading Czech-Austrian anatomist, ophthalmologist, physiologist, writer and university professor. He wrote the first genuine textbook on physiology and created the concept of nerve conduction among other theories. He was a staunch promoter of the modern reflex theory.

He studied medicine in Prague and Vienna, and from 1778 until 1791 was a professor of anatomy, physiology and ophthalmology at the University of Prague. In 1791 he succeeded Joseph Barth as professor of anatomy and ophthalmology at the University of Vienna.

Prochaska was a pioneer in the field of neurophysiology, being remembered for developing a comprehensive theory of reflex action involving the concepts of "vis nervosa" and "sensorium commune". "Vis nervosa" was described as a latent nervous force possessed in the nerves, and the term "sensorium commune" was defined as the point of reflection between the sensory and motor nerves.

Prochaska used the term "vis nervosa" as a direct analogy to Isaac Newton's "vis gravitans", due to his belief that "vis nervosa" was an elemental form of energy, that could not be observed except through its effects such as reflexes and reflections, adhering to natural laws that could be described (as could Newton's theories of gravitation), but at the same time were unexplainable.

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