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Figure 17a.  Fibrocartilaginous insertion of the supraspinatus tendon. (a) Photograph of a cryomicrotome section obtained from the cadaver of a 37-year-old woman shows the fibrocartilaginous insertion on the "shelf" (straight arrows), as well as the adjacent hyaline cartilage (curved arrows). The fascicles of the overlying supraspinatus tendon curve toward their attachment sites (arrowheads). (b) Permission to reprint this figure electronically was denied by the publisher. See print version. (c) Oblique coronal proton-density–weighted MR image shows the hypointense fibrocartilaginous insertion site (straight arrows) and adjacent hyaline cartilage (curved arrows). (d) Coronal (longitudinal) US image shows the hypoechoic fibrocartilaginous insertion site (straight arrows) as well as the adjacent, hypoechoic hyaline articular cartilage (curved arrows).