ramus communicans
noun
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Medical Definition of ramus communicans
: 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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