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fallopian tube

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(fă-lō′pē-ăn) The hollow, cylindrical structure that extends laterally from the lateral angle of the fundal end of the uterus and terminates near the ovary. It conveys the ovum from the ovary to the uterus and spermatozoa from the uterus toward the ovary. Each lies in the superior border of the broad ligament of the uterus. SYN: oviduct; uterine tube. SEE: female genitalia for illus.; uterus.

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ANATOMY: The isthmus (the narrow region near the uterus) continues laterally as a wider ampulla. The latter expands to form the terminal funnel-shaped infundibulum, at the bottom of which lies a small opening, the ostium, through which the ovum enters the tube. Surrounding each ostium are several finger-like processes called fimbriae extending toward the ovary. Each tube averages about 4½ in (11.4 cm) in length and ¼ in (6 mm) in diameter. Its wall consists of three layers: mucosa, muscular layer, and serosa. The epithelium of the mucosa consists of ciliated and nonciliated cells. The muscular layer has an inner circular and an outer longitudinal layer of smooth muscle. Ciliary action and peristalsis move the ovum or zygote toward the uterus. The serosa is connective tissue underlying the peritoneum.

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falloposcopy

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(fă-lō-pos′kŏ-pē) [fallop(ian tube) + -scopy] Imaging the interior of the fallopian tube (the endosalpinx) with a flexible fiber-optic endoscope. The procedure is used in the diagnosis and treatment of tubal infertility.

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fallotomy

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(făl-ŏt′ō-mē) Salpingotomy.

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fallout

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Settling of radioactive molecules from the atmosphere after their release into the air following an explosion or radiation accident.

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falls, risk for

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Vulnerable to increased susceptibility to falling, which may cause physical harm and compromise health. SEE: Nursing Diagnoses Appendix.

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false imprisonment

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An intentional tort; unlawful intentional confinement of another within fixed boundaries so that the confined person is conscious of the confinement or harmed by it.

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false-negative

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(făwls′nĕg′ă-tĭv) A test result that falsely indicates that a condition is not present when in fact it is. SEE: Bayes' theorem; false-positive.

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false-negative ratio

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ABBR: FNR. The ratio of subjects affected by an illness whose test results wrongly suggest they are disease-free to all those subjects who have the disease. The false-negative ratio of a test is useful in determining the test's reliability, i.e., the higher the ratio, the less reliable the test.

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A high FNR may be biological or analytical in origin. Biological false-negative test results may occur when a test is performed at the wrong stage of an illness, e.g., before an antibody or antigen is found in the blood. Analytical false negatives may result when a test lacks adequate sensitivity or specificity to detect an agent that is ...

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