THE LEFT BUNDLE BRANCH AND THE SUBAORTIC MUSCLE.
This series of 4 photos shows a dissection of the left bundle branch covered by the subaortic muscle. This anatomic structure is present in 20% of the hearts. This band of muscle seems to be put just to protect the left bundle for the injury of the stent during TAVI procedures. Seems also to be in a bad place if this bundle is hypertrophic and generates an intermitent left bundle block. Nobody knows. By pure luck, this is an anatomical website and I have the option to only show not think about what I am showing.

Image #67