(Chapter 4) Footnote 51:

Vesalius cites De partibus animalium Bk 2 chapter 9, where see 654b.19 and 25. According to LSJ, the application of the term to organs of sensation was first made by Erasistratus (3rd cent. BC), quoted by Galen De placitis Hippocratis et Platonis 7.8.13.1. The distinction between motor (kinhtika/) and sensory (ai)sqhtika/) nerves was credited by Rufus Ephesius to Erasistratus (Von Staden 1989, pp. 200f., 250f.). For the distinction of nerves from ligaments in antiquity, see Solmsen 1961, 150-167, 169-197. The conflation of nerves and tendons persists in modern parlance, e.g. to “strain every nerve,” meaning “to make the utmost (physical) exertion” (OED2).