File:Crura 1.png
R,right crus; R1,fasciculus of right crus passing to left of esophageal passage; L,left crus; T,musculus suspensorius duodeni (muscle of Treitz); X, small muscular fasciculus, sometimes present, passing from the medial aspect of the left crus and through the fibres of the right crus towards the caval opening.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1289144/