bundle of His

synonym: atrioventricular bundle
https://doi.org/10.1351/goldbook.10481
Band of specialized cardiac muscle fibers connecting the atria with the ventricles of the heart.
Note: These muscle fibers conduct the electrical impulse that regulates the heartbeat from the right atrium to the ventricles.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 732 [Terms] [Paper]