choked disk


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disk

 [disk]
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.
Papilloedema with swelling of the optic nerve head, caused by increased intracranial pressure with oedema-induced blurring of the disk margins and obliteration of the optic cup, elevation of the nerve head, capillary congestion, hyperemia, venous engorgement, loss of venous pulse, peripapillary exudates, retinal wrinkling, and punctate nerve fiber layer hemorrhage; if pressure is reduced, fundus returns to normal without loss of vision; increased intracranial pressure is due to meningoencephalitis, hemorrhage, metabolic disease, toxins, trauma, or tumours

choked disk

Ophthalmology Papilledema with swelling of the optic nerve head, caused by ↑ intracranial pressure with edema-induced blurring of the disk margins and obliteration of the optic cup, elevation of the nerve head, capillary congestion, hyperemia, venous engorgement, loss of venous pulse, peripapillary exudates, retinal wrinkling, and punctate nerve fiber layer hemorrhage; if pressure is reduced, fundus returns to normal without loss of vision; ↑ intracranial pressure is due to meningoencephalitis, hemorrhage, metabolic disease, toxins, trauma, tumors. See Pseudotumor cerebri.

disk

(disk) [Gr. diskos, a dish, quoit]
A flat, round, platelike structure. Synonym: disc

anisotropic disk

A band.

articular disk

The biconcave oval disk of fibrous connective tissue that separates the two joint cavities of the temporomandibular joint on each side.

choked disk

Papilledema.

dental disk

A thin circular paper (or other substance) used to abrade, cut, or polish teeth or dental appliances.

embryonic disk

An oval disk of cells in the blastocyst of a mammal from which the embryo proper develops. Its lower layer, the endoderm, forms the roof of the yolk sac. Its upper layer, the ectoderm, forms the floor of the amniotic cavity. The primitive streak develops on the upper surface of the disk. See: embryo for illus.

Engelmann disk

[Theodor W. Engelmann, Ger. physiologist, 1843–1909]
H band.

epiphyseal disk

A disk of cartilage at the junction of the diaphysis and epiphyses of growing long bones. Cartilage synthesis provides for growth in length; eventually the cartilage is replaced by bone.

germinal disk

A disk of cells on the surface of the yolk of a teloblastic egg from which the embryo develops. Synonym: proligerous disk; blastoderm

Hensen disk

See: Hensen, Christian Andreas Victor.

herniated disk

Rupture of the soft tissue that separates two vertebral bones into the spinal canal or adjacent spinal nerve roots. Herniation of intervertebral disks can cause back pain and, occasionally, loss of neurological function in the distribution of affected nerves. Synonym: herniated intervertebral disk; lumbar disk prolapse; slipped disk See: herniation of nucleus pulposus for illus

herniated intervertebral disk

herniated disk.
Enlarge picture
INTERCALATED DISK: Intercalated disk at the ends of adjacent cardiac muscle cells

intercalated disk

A modification of the cell membrane of adjacent cardiac muscle cells; it consists of extensive folds and intercellular junctions for electrical and mechanical linkage of contiguous cells.
See: illustration

intervertebral disk

The fibrocartilaginous tissue between the vertebral bodies. The outer portion is the anulus fibrosus; the inner portion is the nucleus pulposus. The disk is a shock absorber, or cushion, and permits movement.

M disk

M line.

Merkel disk

See: Merkel disk

optic disk

The area of the retina where the optic nerve enters.
Synonym: blind spot (1)

Placido disk

See: Placido disk

proligerous disk

Germinal disk.

slipped disk

Colloquial term for herniated disk.

tactile disk

Merkel disk.

Z disk

A thin, dark disk that transversely bisects the I band (isotropic band) of a striated muscle fiber. The thin filaments, made primarily of actin, are attached to the Z disk; the area between the two Z disks is a sarcomere, the unit of contraction.

disk

a circular or rounded flat plate. See also intervertebral disk.

articular 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.
choked disk
papilledema.
embryonic disk
a flattish area in a cleaved ovum in which the first traces of the embryo are seen. Called also germinal disk.
disk explosion
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.
germinal disk
the embryo in a hen egg.
intra-articular disk
articular disk.
olfactory disk
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.
slipped disk
the popular name for prolapse of the nucleus of an intervertebral disk.