Türck showed that degeneration in a nerve track corresponds to the direction in which it conducts nerve impulses – ascending tracks degenerate above the lesion and descending tracks below it.

Türck was the first to note the correlation of retinal hemorrhage with tumors of the brain.

Türck, at first sceptical of Garcia’s laryngoscope, later adopted it and claimed from Czermak priority in its clinical employment; these two gentlemen fought one another bitterly for some years over this point.

On p. 295 is a classic description of laryngitis sicca – “Türck’s trachoma”.

Investigation of the cutaneous distribution of the separate pairs of spinal nerves.