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Figure 1 Preparing the atrial muscle specimens. The right atrium appendage (top left) is fixed with needles (above right) to prepare the Trabeculae carneae manually and carefully under the microscope (bottom left) to get strips measuring 3 × 0.5 × 0.5 mm3, which are fixed between two tweezers of the muscle investigation system (bottom right).

Figure 1 Preparing the atrial muscle specimens. The right atrium appendage (top left) is fixed with needles (above right) to prepare the Trabeculae carneae manually and carefully under the microscope (bottom left) to get strips measuring 3 × 0.5 × 0.5 mm<sup>3</sup>, which are fixed between two tweezers of the muscle investigation system (bottom right).