The septomarginal trabecula (more commonly known as the moderator band) is a muscular band of heart tissue found in the right ventricle of the heart. It carries part of the right branch of the atroventricular bundle from the septum to the opposite wall of the ventricle.
The Italian polymath Leonardo di ser Piero da Vinci discovered the moderator band in a bovine heart around 1513. Here is a drawing of the moderator band marked as “D” on a scan of his manuscript:
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Here is a photograph of a moderator band in a human heart:
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Here is a portrait of Leonardo da Vinci:
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