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macula of retina[TA]
an oval area of the sensory retina, 3 × 5 mm, temporal to the optic disc corresponding to the posterior pole of the eye; at its center is the central fovea, which contains only retinal cones.
See macula lutea.
1. A small surface area differing in appearance from its surroundings. Synonym: macula
2. Randomly collected, as in “spot” urine specimen.
White macules found on the trunk and extremities of persons with tuberous sclerosis.
Bitot spotsSee: Bitot spots
1. Physiological scotoma situated 15° to the outside of the visual fixation point; the point where the optic nerve enters the eye (optic disk), a region devoid of rods and cones. See: scotoma
2. In psychiatry, the inability of an individual to have insight into his or her own personality.
blue spotMongolian spot.
Brushfield spotSee: Brushfield spot
A red spot occurring on the retina in children with Tay-Sachs disease.Synonym: Tay spot
An area on a nuclear medicine scan in which no radioactive tracer is taken up, indicative of nonfunctioning tissue in a gland or other structure.
A tiny infarct in the retina, present in hypertension, diabetes mellitus, bacterial endocarditis, and other diseases.
The area on the x-ray tube target that is bombarded with electrons to produce x-radiation.
Fordyce spotsSee: Fordyce disease
The area on the nasal mucosa that tends to bleed during menstruation.See: vicarious menstruation
Any of the focal red marks seen on esophageal varices. They consist of aneurysms of the wall of the dilated blood vessel. Their presence increases the likelihood that the varix may bleed.
Scarring of the macula found in those infected with Histoplasma capsulatum.
1. An area on the surface of the skin that, when stimulated, experiences a sensation of warmth.
2. In a nuclear medicine scan, a region of the image that shows an abnormally high concentration of injected isotope.
3. Any location that has been radioactively contaminated.
4. . In radiation oncology, a tissue region that is exposed to much more radiation than neighboring tissues.
hypnogenic spotHypnogenic zone.
Koplik spotSee: Koplik spot
A popular term for a pigmentary skin discoloration, usually in yellow-brown patches.See: Lentigo senilis
A dense area of macrophages in the omentum.
Any of the blue or mulberry-colored spots usually located in the sacral region. It may be present at birth in Asian, American Indian, black, and Southern European infants and usually disappears during childhood.Synonym: blue spot See: illustration
Rose-colored maculae occurring on the abdomen or loins in typhoid fever.
Roth spotsSee: Roth spots
ruby spotCherry angioma.
The colloquial name for necrobiosis lipoidica diabeticorum. This condition is usually, but not always, associated with diabetes.See: necrobiosis lipoidica diabeticorum
Soemmering spotSee: Soemmering, Samuel T. von
Tardieu spotSee: Tardieu spot
Tay spotSee: cherry-red spot
Trousseau spotsSee: Trousseau, Armand
Light-colored, elevated areas of various sizes occurring on the ventricular surface of the anterior leaflet of the mitral valve in endocarditis.
yellow spotAbbreviation: y.s.
yellow spotThe MACULA LUTEA of the RETINA.
An oval area of the retina 3-5 mm in diameter, with the foveal depression at its centre, slightly below the level of the optic disc and temporal to it (its centre lies 3.5 mm from the edge of the disc). The side wall of the depression slopes gradually towards the centre where the fovea centralis is located and where the best photopic visual acuity is obtained. Around the fovea, the ganglion cells are much more numerous than elsewhere, being arranged in five to seven layers. The outer molecular layer is also thicker than elsewhere and forms the outer fibre layer of Henle and there is a progressive disappearance of rods so that at the foveola only cones are found. The area of the macula lutea is impregnated by a yellow pigment (macular pigment) in the inner layers and for that reason is often called the yellow spot. Syn. area centralis (although that area is considered to be slightly larger, about 5.5 mm in diameter); punctum luteum. See blue field entoptoscope; fovea centralis; macular pigment.