Medical Dictionary

annulus fibrosus

play
noun annulus fi·bro·sus \ -fī-ˈbrō-səs, -fi- \
variants: also anulus fibrosus play \ˈan-yə-ləs-\

medical Definition of annulus fibrosus

:a ring of fibrous tissue (such as that surrounding a heart valve); especially :the outer portion of an intervertebral disk that surrounds the nucleus pulposus and is composed chiefly of layers of collagen fibers
  • Disks between the vertebrae have a soft center—a nucleus pulposus—and a tougher exterior, annulus fibrosus.
  • —Matthew SturdevantThe Hartford (Connecticut) Courant30 May 2010
  • The nucleus pulposus can bulge out or herniate the anulus fibrosus, but the disk itself does not “slip.”
  • —John PaloNewsday21 Feb. 1990

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