An Aponeruosis (sometimes referred to in Gray’s Anatomy as an “Aponeurotica“) is essentially a flattened out tendon. Most of the time Aponeuroticae are simply referred to as Fascia. Instead of writing about it, it is much easier to show you a few examples.
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The bottom line is that no matter what you call it (fascia, tendon, aponeurosis), it is basically the same stuff — ELASTIC, COLLAGEN-BASED CONNECTIVE TISSUE, and we fix it in largely the same way. You can learn more about this process by browsing our FASCIA or TENDINOSIS pages.