herniation

herniation /her·ni·a·tion/ (her?ne-a´shun) abnormal protrusion of an organ or other body structure through a defect or natural opening in a covering, membrane, muscle, or bone.

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herniation of intervertebral disk  herniated disk; protrusion of the nucleus pulposus or anulus fibrosus of the disk, which may impinge on nerve roots.

herniation of nucleus pulposus  see h. of intervertebral disk.

tentorial herniation  downward displacement of the most medially placed cerebral structures through the tentorial notch, caused by a supratentorial mass.

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herniation

abnormal protrusion of an organ or other body structure through a defect or natural opening in a covering membrane, muscle or bone. See also hernia and individual anatomical sites for hernia.

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nucleus pulposus herniation

rupture or prolapse of the nucleus pulposus into the spinal canal, or against the spinal cord. See also intervertebral disk disease.

transtentorial herniation

downward displacement (caudal transtentorial herniation; uncal herniation) of the medial brain structures through the tentorial notch by a supratentorial mass, exerting pressure on the underlying structures, including the brainstem.

uncal herniation

transtentorial herniation.