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anulus fibrosus |
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anulus /anu·lus/ (an´u-lus) pl. a´nuli [L.] a small ring or encircling structure; spelled also annulus. anulus fibro´sus 1. fibrous ring of heart: one of the dense fibrous rings that surround the right and left atrioventricular (tricuspid and mitral) orifices and to which are attached the atrial and ventricular muscle fibers. 2. fibrous ring of intervertebral disk; the circumferential ringlike portion of an intervertebral disk. anulus of nuclear pore a circular filamentous structure surrounding a nuclear pore in the nuclear membrane of a cell. anulus of spermatozoon an electron-dense body at the caudal end of the neck of a spermatozoon. anulus fibrosus, an outer ring of collagen in an intervertebral disk arranged in a lamellar configuration that surrounds a wider zone of fibrocartilage. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The outside of the disk is a fibrous substance called the annulus fibrosus. [10] Type I collagen predominates in tissues such as bones, tendons, ligaments, joint capsules, and the annulus fibrosus of the IVD. [35,36] End-range extension is stabilized primarily by the anterior longitudinal ligament, the anterior aspect of the annulus fibrosus, and the zygapophyseal joints. |
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