a circular or rounded flat plate; often spelled disc in names of anatomic structures.
articular disk a pad of fibrocartilage or dense fibrous tissue present in some synovial joints.
Bowman's disk one of the flat plates making up a striated muscle fiber.
) (germinal disk
) a flattened round bilaminar plate of cells in the blastocyst
of a mammal, where the first traces of the embryo are seen; called also embryonic
or germinal area
the layer of fibrocartilage between the bodies of adjoining vertebrae
; see also herniated disk
Merkel's d's small cup-shaped tactile receptors in the skin that are particularly sensitive to continuous pressure.
the intraocular part of the optic nerve formed by fibers converging from the retina and appearing as a pink to white disk in the retina; there are no sensory receptors in the region and hence no response to stimuli. Called also blind spot
slipped disk (slĭpt)
Protrusion of a part of an intervertebral disk through the fibrocartilage, occurring usually in the lower lumbar region and often causing back pain or sciatica.
slipped disk A popular term for any anatomic defect—bulge, degeneration, herniation, prolapse, rupture or tear—in the intervertebral disc, which may be accompanied by symptoms of nerve impingement, including pain and paraesthesias.
a circular or rounded flat plate. See also intervertebral disk.
a pad of fibrocartilage or dense fibrous tissue present in some synovial joints. As specialized intra-articular structures they differ from articular plates in that they have nerve and blood supplies.
a flattish area in a cleaved ovum in which the first traces of the embryo are seen. Called also germinal disk.
the lesion produced by a sudden extrusion of non-degenerate nucleus pulposus from intervertebral disks into the cervical vertebral canal as a result of trauma.
the embryo in a hen egg.
these develop on the ventrolateral aspects of the head early in fetal development. They deepen, are surrounded by the developing nasal processes, then break through into the oral cavity and become the nasal cavities.
the popular name for prolapse of the nucleus of an intervertebral
2. dislocated or out of place in a more general sense.
flexion of the posterior claw in canaries so the dorsal surface becomes weight-bearing. May be caused by riboflavin deficiency.
Patient discussion about slipped disk
Q. I have a low back pain that radiates to my leg when i pick up stuff. Is it a disc herniation? I am a 43 years old bank teller. During the past 5 months I've suffered from a low back pain. The pain is not very strong, but it gets much worse while doing physical activity. When i walk or lift heavy things the pain is even stronger, and it radiates to my left leg. Can it be signs for disc herniation?
A. It's possible that you have a nerve impingement from a disc herniation, but not necessarily so. What you need to know is that even if you have a herniated disc, the question is what would the recommended treatment be? More discussions about slipped disk
90% or more of herniated discs resolve without surgical treatment within 6 months. MRI imaging is generally only indicated if one is considering surgery; in other words, your pain and neurological status is such that surgery is clinically indicated. Then, an MRI may be helpful for the surgeon. If surgery is not indicated based on clinical/symptoms, then it probably is unwise to get an MRI. They often show abnormalities that are simply 'red herrings' and often prompt people to proceed with surgery that really is not needed. Beware!