Derivational etymology, probably designed for the meaning "nerve" rather than the meaning "sinew", as is clear from the last sentence "what is more exciting than the mind?": this probably refers to the brain, from which the nerves are born, and the nerves impede motion by exciting the muscles. So, the nerve is what sets in motion the body parts and the various organs. The verb νέομαι is here used as a synonym of "to go", as is the case in other etymologies in which any motion verb can be used in order to provide the required phonetic sequence. The formulation may be corrupt in Orion's main manuscript—compare one of the excerpta (see Parallels) where the definition is clearer: the nerve "runs through the whole body"