The discovery of the septomarginal trabecula.

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definition

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[1]. It carries part of the right branch of the atroventricular bundle from the septum to the opposite wall of the ventricle[2].

DISCOVERY

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[3] of his manuscript:

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Here is a photograph[4] of a moderator band in a human heart:

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discoverer

Here is a portrait[5] of Leonardo da Vinci:

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1452-1519

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sources
  1. https://en.wikipedia.org/wiki/Moderator_band_(heart)
  2. https://medical-dictionary.thefreedictionary.com/Septomarginal+trabecula
  3. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2804084/
  4. https://blog.valdosta.edu/ap2/heart-dissection-photos/
  5. https://www.biography.com/artist/leonardo-da-vinci