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sporozoite

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(spor″ŏ-zō′īt″) An elongated sickle-shaped immature malarial parasite that develops from a sporoblast within the malarial oocyst. Upon bursting of the oocyst within a mosquito, sporozoites are released into the body cavity and make their way to the salivary gland. They are introduced into human blood by a mosquito and almost immediately enter liver cells, where they go through two schizogonic divisions and then reenter the bloodstream and infect erythrocytes.

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sport

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[ME. sporten, to divert] Mutation.

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sports medicine

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SEE: under medicine.

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sports vision

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SEE: under vision.

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sporulation

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(spor-ū-lā′shŭn) [L. sporula, little spore] 1. The production of spores, a method of reproduction in fungi, mosses, and ferns. 2. Bacterial production of spores, resistant forms that can withstand extremes of heat and cold, and dehydration.

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spot

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

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ash-leaf s. White macules found on the trunk and extremities of persons with tuberous sclerosis.

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Bitot s. SEE: Bitot spots.

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blind s. 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 a person to have insight into his or her own personality.

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blood s. A dried specimen of blood placed on filter paper, used for laboratory analysis, as for congenital metabolic diseases.

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blue s. Mongolian s.

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Brushfield s. SEE: Brushfield spot.

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cherry-red s. A red spot visible on the retina of children with sphingolipid disorders, such as Niemann-Pick disease or Tay-Sachs disease. SYN: Tay s.

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cold s. 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.

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corneal s. Leukoma.

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cotton-wool s. A tiny white infarct with soft or blurred borders in the retina, and present in hypertension, diabetes mellitus, bacterial endocarditis, and other diseases. SYN: soft exudate.

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

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Fordyce s. SEE: Fordyce disease.

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genital s. The area on the nasal mucosa that tends to bleed during menstruation. SEE: vicarious menstruation.

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hematocystic s. Any of the focal red marks seen on esophageal varices. They consist of aneurysms of the wall of the dilated blood vessel. Their ...

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