"Posterolaterally, the annulus is not only thinner but also has more disorganised collagen bundles, and a greater proportion of vertical fibres, contributing to it being the weakest part and accounting for the high rate of disc herniation. Furthermore, the composition of particularly the annulus fibrosis varies by spinal level."
"Anulus fibrosus is the official spelling indicated by Terminologia Anatomica 6. The commonly used English word annulus is a misspelling of its Latin root ānulus."
Expected headings
"Functional anatomy"
"The peripheral fibres of the annulus fibrosus have the function of anchoring the intervertebral disc to the vertebra; they "merge", anteriorly and posteriorly, with the longitudinal ligaments 4. Unlike the nucleus pulposus, on which mainly compressive forces act, the fibres of the annulus fibrosus resist the tensile and the compressive stresses to which the intervertebral disc is subjected."