  The functioning of the human brain, nervous system and heart is based on the
conduction of electrical signals. These electrical signals also create magnetic
fields which extend outside the human body. Highly sensitive magnetometers,
such as superconducting quantum interference device magnetometers or optically
pumped magnetometers, placed outside the human body can detect these
biomagnetic fields and provide non-invasive measurements of e.g. brain
activity, nerve impulses, and cardiac activity. Animal models are used widely
in medical research, including for disease diagnostics and for drugs testing.
We review the topic of biomagnetic recordings on animal models using optically
pumped magnetometers, and present our experiments on detecting nerve impulses
in the frog sciatic nerve and the heart beat in an isolated guinea pig heart.
