streak

A line, stria, or stripe, especially one that is indistinct or evanescent. [A.S. strica]

- angioid streaks calcification of lamina basalis choroideae visible in the peripapillary fundus oculi; associated with pseudoexanthoma elasticum, sickle cell disease, and Paget disease; predisposing to choroidal neovascularization. SYN: elastosis dystrophica, Knapp streaks, Knapp striae.

- germinal s. SYN: primitive s..

- gonadal s. a form of aplasia in which the ovary is replaced by a functionless tissue, as found in Turner syndrome. SYN: s. gonad.

- Knapp streaks SYN: angioid streaks.

- meningitic s. a line of redness resulting from drawing a point across the skin, especially notable in cases of meningitis. SYN: Trousseau spot.

- Moore lightning streaks photopsia manifested by vertical flashes of light, seen usually on the temporal side of the affected eye, caused by the involutional shrinkage of vitreous humor.

- primitive s. ridge of epiblast in the midline at the caudal end of the embryonic disk from which arises the intraembryonic mesoderm and definitive endoderm; achieved by inward and then lateral migration of cells; in human embryos, it appears on day 15 and provides visual evidence of the cephalocaudal axis. SYN: germinal s..

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streak 'strēk n

1) a usu. irregular line or stripe see PRIMITIVE STREAK

2) inoculum implanted (as with a needle drawn across the surface) in a line on a solid medium

streak vt to implant (inoculum) in a line on a solid medium

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n.

(in anatomy) a line, furrow, or narrow band. See also primitive streak.

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(strēk) a line, stria, striation, or stripe.