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left fibrous trigone (heart, anatomy)
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The left fibrous trigone of the heart is a collagenous thickening of the most inferior point of the fibrous skeleton attached to the left posterior leaflet of the aortic valve. It also forms a point of attachment for part of the fibrous skeleton of the mitral valve:

  • most of the anterior leaflet of the mitral valve
  • the fila coronaria, a fibrous band extending around the mitral valve orifice

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