posterior ramus of spinal nerve
英[pɔˈstɪəri:ə ˈreiməs ɔv ˈspaɪnəl nə:v]美[pɑˈstɪriɚ ˈreməs ʌv ˈspaɪnəl nɚv]
The posterior (or dorsal) branches (or divisions) of the spinal nerves are as a rule smaller than the anterior divisions. They are also referred to as the dorsal rami.