One of the mysteries of the English language finally explained.
A branch of a nerve or blood vessel that joins another nerve or blood vessel; specifically a bundle of nerve fibres joining a sympathetic ganglion and a spinal nerve. Frequently with distinguishing Latin or English word, typically indicating the anatomical location or the type of nerve fibre forming the branch.
Late 18th century; earliest use found in Charles Bell (1774–1842), physiologist and surgeon. From post-classical Latin ramus communicans from classical Latin rāmus branch + commūnicāns, present participle of commūnicāre.
ramus communicans/ˌreɪməs kəˈmjuːnɪk(ə)nz/
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