infraspinous fascia infraspinous fascia the infraspinatous fascia is a dense fibrous membrane, covering the infraspinatous muscle and fixed to the circumference of the infraspinatous fossa; it affords attachment, by its deep surface, to some fibers of that muscle. it is intimately attached to the deltoid fascia along the over-lapping border of the deltoideus. infraspinous fasciamuscles on the dorsum of the scapula, and the triceps brachii. (fascia not labeled, but infraspinatous visible near center.)detailsidentifierslatinfascia infraspinatata98a04.6.02.009ta22539fma38530anatomical terminology