Nerve Signal Magnetometer (IMAGE) University of Copenhagen - Niels Bohr Institute Caption Seen at the top is a sciatic nerve from a frog. On the bottom left is the glass container with caesium gas, which is used to measure the magnetic field from the nerve. On the bottom right is the measured magnetic field, which is generated by the magnetic fields from the electrical impulses that flow through the nerve. Credit Kasper Jensen, NBI Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.