Licence: Public Domain Mark
Credit: The heart and its muscle fibres. Engraving, 1686. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/V0007778EL/full/800%2C/0/default.jpg)
Licence: Public Domain Mark
Credit: The heart and its muscle fibres. Engraving, 1686. Wellcome Collection. Source: Wellcome Collection.