Medical Definition of ramus communicans
plural rami com·mu·ni·can·tes \-kə-ˌmyü-nə-ˈkan-ˌtēz\play
: 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 communicansb: one consisting of unmyelinated postganglionic fibers—called also gray ramus, gray ramus communicans
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