What is an accurate description of the normal physiological condition of annulus fibrosis tissue?

The selection of the description that recognizes the extracellular matrix of the annulus fibrosus as tendon-like in the outer section is grounded in the composition and functional significance of this tissue. The annulus fibrosus is part of the intervertebral disc, primarily composed of collagen fibers, specifically type I and type II collagen, and proteoglycans.

In its outer region, the annulus fibrosus exhibits a structure and mechanical properties similar to tendons, characterized by strong, organized collagen fibers that provide tensile strength and stability. This arrangement allows the tissue to withstand considerable mechanical loads and resist tension from various directions, which is critical for the functionality of the spine. The similarity to tendon-like tissue is essential for the annulus fibrosus's role in maintaining spinal integrity and absorbing shock.

In contrast, the inner section of the annulus fibrosus does not exhibit bone-like properties; rather, it is more gelatinous and less organized. Furthermore, the typical strain on the tissue generally exceeds what is mentioned, and the frequency range cited does not align with standard physiological conditions for the annulus fibrosus. Therefore, characterizing the extracellular matrix in the outer section as tendon-like accurately reflects its mechanical properties and functional role in the inter