The
posterior ramus of spinal nerve (or
posterior primary division) refers to the posterior division of a
spinal nerve. The ramus is also known by a number of other names, "posterior (or dorsal) rami (or branches or divisions) of the spinal nerves". The posterior ramus is one of two major branches of a
spinal nerve that emerge after the nerve emerges from the
intervertebral foramen. The posterior ramus carries information that supplies muscles and sensation to the human back.