yellow spot

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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.

yellow spot

spot

(spot)
1. A small surface area differing in appearance from its surroundings. Synonym: macula
2. Randomly collected, as in “spot” urine specimen.

ash-leaf spot

White macules found on the trunk and extremities of persons with tuberous sclerosis.

Bitot spots

See: Bitot spots

blind spot

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 spot

Mongolian spot.

Brushfield spot

See: Brushfield spot

cherry-red spot

A red spot occurring on the retina in children with Tay-Sachs disease.
Synonym: Tay spot

cold 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.

corneal spot

Leukoma.

cotton-wool spot

A tiny infarct in the retina, present in hypertension, diabetes mellitus, bacterial endocarditis, and other diseases.

focal spot

The area on the x-ray tube target that is bombarded with electrons to produce x-radiation.

Fordyce spots

See: Fordyce disease

genital spot

The area on the nasal mucosa that tends to bleed during menstruation.
See: vicarious menstruation

hematocystic spot

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.

histo spots

Scarring of the macula found in those infected with Histoplasma capsulatum.

hot spot

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 spot

Hypnogenic zone.

Koplik spot

See: Koplik spot

liver spot

A popular term for a pigmentary skin discoloration, usually in yellow-brown patches.
See: Lentigo senilis

milk spot

A dense area of macrophages in the omentum.
Enlarge picture
MONGOLIAN SPOTS

mongolian spot

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 spots

Rose-colored maculae occurring on the abdomen or loins in typhoid fever.

Roth spots

See: Roth spots

ruby spot

Cherry angioma.

shin spots

The colloquial name for necrobiosis lipoidica diabeticorum. This condition is usually, but not always, associated with diabetes.
See: necrobiosis lipoidica diabeticorum

Soemmering spot

See: Soemmering, Samuel T. von

Tardieu spot

See: Tardieu spot

Tay spot

See: cherry-red spot

Trousseau spots

See: Trousseau, Armand

white spots

Light-colored, elevated areas of various sizes occurring on the ventricular surface of the anterior leaflet of the mitral valve in endocarditis.

yellow spot

Abbreviation: y.s.
Macula (3).

yellow spot

The MACULA LUTEA of the RETINA.

macula lutea

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.
References in periodicals archive ?
1V (MZFC 18350); anal sheath grooved medially, opening at midlevel of thighs; thoracic and tarsal folds absent; posterior part of belly, chest, ventromedial part of thighs, and anterior part of throat deep purplish with brassy pigment; flank and posterior surfaces of thighs black with yellow spots and green cast (Mendelson and Toal 1996; see Adler and Dennis 1972 for coloration characters).
8 in SL; no sexual dichromatism; mid-dorsal, neon blue stripe on head; irregular orange bands on side of snout and cheek; prominent yellow and blue-margined black spot on middle of operculum; about 16-18 short brown bars along middle of side; first dorsal fin blue except pale yellow basally, row of large, irregular yellow spots (one between each spine) just below middle of fin, and tip of each spine yellow; second dorsal fin blue with pair of yellow stripes; anal fin mainly yellow except blue on distal third; caudal fin blue with large yellow spot medially at base from which pale yellow rays radiate posteriorly; pectoral fins with pair of large yellow spots at base and neon blue marking on uppermost part of base.
scutum with a large band on anterior margin, extending laterally; two very small yellow spots on the propodeum to either side of the propodeal orifice; tergum I with a yellow band; tergum and sternum II-IV with yellow bands; terga III-IV with evanescent yellow bands.
In addition, Gimeno said that the archaeological resin of the amphora found was hard and blackish with yellow spots, unlike present-day resin, which is more malleable and orangey in colour, similar to the fresh sap of the tree.
The objective is to improve on nature," he said, waving his brush in front of his canvas before carefully adding yellow spots to the green bushes in his painting.
The girl steps outside her home and imagines that a driveway puddle is a blue lake and her jump rope is a green snake with yellow spots named Einstein who likes to bask in the sun.
In contrast, when the precipitated powder from cell-free supernatant was compared chromatographically with the chemically hydrolyzed (acid hydrolysis) products, one yellow spot parallel to the yellow spots of acid hydrolyzed was appeared.
The light brown female spider, with glinting black eyes and black and yellow spots, was guarding an enormous egg sack of about 200 babies.
The treats are easy to give, extremely palatable and can be highly effective in preventing yellow spots and lawn burn.
There are increased rates of atopy and there are oral manifestations [in the form of] dental enamel defects such as yellow spots, white spots, and brown spots," he added.
The skin is usually red but may peel or yellow spots may appear.