ramus com·mu·ni·cans | \ -kə-ˈmyü-nə-ˌkanz 
\
\ plural rami communicantes\ -kə-ˌmyü-nə-ˈkan-ˌtēz \
\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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