<unk>  phenomenon, also called the barber chair phenomenon, is an uncomfortable "electrical" sensation that runs through the back and into the limbs. The sensation can feel like it goes up or down the spine. In many people, it is elicited by bending the head forward. It can also be evoked when a practitioner pounds on the cervical spine while the neck is flexed; this is caused by involvement of the posterior columns.<unk>  phenomenon is named after the French neurologist Jean<unk> . __TOC__
Lhermitte's sign
Lowenberg's sign
Oppenheim's sign
Larrey's sign
D'Espine sign
Moniz sign
Palla's sign
Munson's sign