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ramus com·mu·ni·cans

npl  rami com*mu*ni*can*tes   :  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  .

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