What is "inhibitory nerves"

Inhibitory \In*hib"i*to*ry\,

1. [LL. inhibitorius: cf. F. inhibitoire.] Of or pertaining to, or producing, inhibition; consisting in inhibition; tending or serving to inhibit; as, the inhibitory action of the pneumogastric on the respiratory center.

   I would not have you consider these criticisms as inhibitory.
   --Lam

2. Inhibitory nerves (Physiol.), those nerves which modify, inhibit, or suppress a motor or secretory act already in progress.