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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.
choked disk papilledema.
ciliary disk pars plana.
embryonic disk (germ disk) (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.
herniated disk see herniated disk.
intervertebral disk the layer of fibrocartilage between the bodies of adjoining vertebrae; see also herniated disk.
intra-articular d's articular disk.
Merkel's d's small cup-shaped tactile receptors in the skin that are particularly sensitive to continuous pressure.
optic disk 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.
ruptured disk herniated disk.
slipped disk popular term for herniated disk.
See blind spot.
The small area in the retina where the optic nerve enters the eye that is not sensitive to light. Also called the blind spot.
Mentioned in: Retinal Vein Occlusion
Mariotte,Edmé, French physicist, 1620-1684.
Mariotte blind spot - an oval area of the ocular fundus devoid of light receptors where the axons of the retinal ganglion cell converge to form the optic nerve head. Synonym(s): optic disk
Mariotte bottle - a stoppered bottle with bottom outlet, used as a reservoir for constant infusions.
Mariotte experiment - an experiment that proves the absence of photoreceptors where the optic nerve enters the eye.
Mariotte law - Synonym(s): Boyle law