cone degeneration |
A retinal abnormality in which colour perception is severely deficient and typical changes occur in electroretinogram.
See: achromatopsia.
Synonym: cone degeneration.
(05 Mar 2000) |
cone disks |
Membranous disk's of flattened sacs about 14 nm thick that occur in the outer segment of cones of the retina.
(05 Mar 2000) |
cone down |
To narrow a beam of X-rays to a region of interest using a collimator or cone; colloq., to delimit one's attention or activities.
(05 Mar 2000) |
cone dystrophy |
A retinal abnormality in which colour perception is severely deficient and typical changes occur in electroretinogram.
See: achromatopsia.
Synonym: cone degeneration.
(05 Mar 2000) |
cone fibre |
A part of the cone cell of the retina; the inner cone fibre is a slender axon-like part of the cone extending from the cell body to the pedicle located in the outer plexiform layer of the retina; in the outer fovea, where the cones are much elongated, they narrow to an
(05 Mar 2000) |
cone granule |
Nucleus of a retinal cell connecting with one of the cones.
(05 Mar 2000) |
cone vision |
Vision when the eye is light-adapted.
See: light adaptation, light-adapted eye.
Synonym: cone vision, photopia.
(05 Mar 2000) |
Politzer's luminous cone |
A triangular area at the anterior inferior part of the tympanic membrane, running from the umbo to the periphery, where there is seen a bright reflection of light.
Synonym: cone of light, light reflex, Politzer's luminous cone, red reflex, Wilde's triangle.
Malacarne's pyramid, a lobule on the undersurface of the cerebellum, the posterior portion of the vermis.
(05 Mar 2000) |
pseudo-cone |
<zoology> One of the soft gelatinous cones found in the compound eyes of certain insects, taking the place of the crystalline cones of others.
Origin: Pseudo- + cone.
Source: Websters Dictionary
(01 Mar 1998) |
s-cone |
Short wavelength sensitive c. (blue c.).
(05 Mar 2000) |
pulmonary cone |
The left or anterosuperior, smooth-walled portion of the cavity of the right ventricle of the heart, which begins at the supraventricular crest and terminates in the pulmonary trunk.
Synonym: arterial cone, pulmonary cone, pulmonary conus.
(05 Mar 2000) |
silver cone |
Pure silver cone with standard conical shape, used with cement to obturate dental root canals.
(05 Mar 2000) |
nerve growth cone |
<cell biology> A specialised region at the tip of a growing neurite that is responsible for sensing the local environment and moving toward the neuron's target cell. Growth cones are hand shaped, with several long filopodia that differentially adhere to surfaces in the embryo. Growth cones can be sensitive to several guidance cues, for example: surface adhesiveness, growth factors, neurotransmitters and electric fields (galvanotropism).
(18 Nov 1997) |
drift cyclotron loss cone instabilities |
(DCLC) This is an electrostatic microinstability (frequencies at harmonics of the ion cyclotron frequency) which is of major concern in small mirror devices. Mode is driven by radial gradients in the electron density, and causes loss of ions due to non-conservation of magnetic moment (see adiabatic invariant) as they interact with the mode, and are dispersed in velocity space into the loss cone. Stabilisation is accomplished by increasing the plasma size and by partially filling the loss cone with a continuous extermal warm plasma stream.
(09 Oct 1997) |
icecream cone |
<radiology> Ball of icecream head of malleus, cone body of incus
(12 Dec 1998) |