Cardiac muscle (IMAGE) Sanford Burnham Prebys Caption A transmission electron micrograph of bundled and banded cardiac muscle. Credit Giorgio Gabella. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection. Usage Restrictions No restrictions. License Public Domain 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.