accelerator fibers

ac·cel·er·a·tor fi·bers

postganglionic sympathetic nerve fibers originating in the superior, middle, and inferior cervical ganglia of the sympathetic trunk, conveying nervous impulses to the heart that increase the rapidity and force of the cardiac pulsations.
Synonym(s): augmentor fibers

ac·cel·er·a·tor fi·bers

(ak-sel'ĕr-ā-tŏr fī'bĕrz)
Postganglionic sympathetic nerve fibers originating in the superior, middle, and inferior cervical ganglia of the sympathetic trunk, conveying nervous impulses to the heart that increase the rapidity and force of the cardiac pulsations.
Synonym(s): accelerator fibres.