medical Definition of ramus communicans
plural rami communicantes
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\-kə-ˌmyü-nə-ˈkan-ˌtēz\
:any of the bundles of nerve fibers connecting a sympathetic ganglion with a spinal nerve and being divided into two kinds:
a
:one consisting of myelinated preganglionic fibers — called also
white ramus, white ramus communicans
b
:one consisting of unmyelinated postganglionic fibers — called also
gray ramus, gray ramus communicans
