Hosta

The supraspinous fascia completes the osseofibrous case in which the supraspinatus muscle is contained; it affords attachment, by its deep surface, to some of the fibers of the muscle.

It is thick medially, but thinner laterally under the coracoacromial ligament.

References

This article incorporates text in the public domain from page 440 of the 20th edition of Gray's Anatomy (1918)