What type of tissue primarily composes the annulus fibrosus?

Study for the NPTE Physical Therapist Assistant Exam. Ace the test with comprehensive flashcards and multiple-choice questions. Each query offers hints and detailed explanations. Get thoroughly prepared for your examination!

The annulus fibrosus is primarily composed of dense collagen fibers, which are crucial for providing structural support and stability to the intervertebral discs in the spine. This tissue structure allows the annulus fibrosus to withstand the various forces and stresses that occur during movement and load-bearing activities. The dense arrangement of collagen fibers contributes to its tensile strength and durability, enabling it to maintain the integrity of the disc by resisting excessive compression and shear forces.

In contrast to these dense collagen fibers, options like elastic cartilage would be more flexible and found in structures requiring elasticity, such as the ear or certain joints, and thus are not suitable for the rigid support needed in the annulus fibrosus. Loose connective tissue is characterized by a more flexible and less structured arrangement of fibers, which offers support but lacks the strength required in this context. Adipose tissue primarily serves as a fat storage and insulation layer, lacking the mechanical properties essential for the function of the annulus fibrosus.

Therefore, the composition of dense collagen fibers is what allows the annulus fibrosus to perform its role effectively in the spine.

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