Theou megaloio hekēti, Ad theses hasce de locorum affectorum cognitione generali

The text continues a discussion on sympathetic and idiopathic affections.
Sympathia, however, is that which is affected on account of another, and this in two ways.

XV.

For it is correctly said to sympathein k'eph' heterō paschein suffer together and suffer on account of another both in the case of that which receives something from a part suffering from its own affection, which is contrary to it; and in the case of that which is deprived of some material or faculty that it ought to receive, on account of a part suffering from its own affection.

XVI.

However, in the reasoning of tēs sympatheias the sympathy, one must distinguish from the other Actions which occur by the use and aid of many parts: as in the voice, for the formation of which other parts provide the material, others impress the form upon this material, and finally others supply the animal force and faculty to those providing both the formal and the material.

XVII.

Thus, one must also distinguish by which instruments motion and sense are supplied through the same or different nerves. For in those cases where this happens through different nerves, it is possible for one or the other of them to perish promiscuously, while the other remains intact: as in the eye and the three smaller fingers.

XVIII.

But in those cases where the faculty of moving and sensing is imparted through the same nerves, it cannot happen that sense perishes while motion is preserved; but on the contrary, with motion harmed, sense can still be intact, as happens in the muscles.