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J

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Symbol for joule.

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Jaboulay, Mathieu

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(zha-boo-lā′) Fr. surgeon, 1860–1913.

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jacket

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[O.Fr. jacquet, jacket] A bandage usually applied to the trunk to immobilize the spine or correct deformities.

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 porcelain j. A jacket crown tooth restoration made of porcelain.

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jackscrew

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(jăk′skroo) A threaded screw used for expanding the dental arch or for positioning bone fragments after a fracture.

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jacksonian seizure

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(jak-sō′nē-ăn) [John Hughlings Jackson, Brit. neurologist, 1835–1911] SEE: under seizure.

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Jackson-Pratt drain

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(jak′sŏn-prat′) A soft tube placed in an operative site to drain blood and inflammatory fluid following surgery. The tube is connected to a small, compressed, plastic bulb. The compression creates suction; the bulb expands as it fills. The collected liquid is emptied and measured when the bulb is about 60% filled, and the bulb is recompressed. The drains are removed when only minimal drainage is observed. Fluid in a surgical wound interferes with healing, can place pressure on suture sites, and increases the risk of infection.

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Jackson syndrome

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A dysfunction of cranial nerves X through XII caused by medullary lesions, resulting in unilateral muscle paralysis in the head, the mouth including the soft palate, and the vocal cords.

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Jacob, Arthur

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(jā′kŏb) Irish ophthalmologist, 1790–1874.

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 J. ulcer Rodent ulcer.

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jactatio

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(jăk-tā′shē-ō) [L., tossing] Restless tossing of the head and body; seen in acute illness. SYN: jactitation.

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 j. capitis nocturna A form of sleep disturbance characterized by nocturnal head-banging.

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jactitation

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(jăk″tĭ-tā′shŭn) [L. jactitatio, tossing] Jactatio.

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Jadad score

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[A.R. Jadad, contemporary Brit. physician] A tabulation of the academic rigor and quality of a clinical trial, based on its randomization, blinding, and monitoring of patient withdrawals and dropouts.

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jamais vu

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(zhăm′ā voo) [Fr., never seen] The subjective sense of being in a completely strange environment when in familiar surroundings. It may be associated with temporal lobe lesions. SEE: déjà vu.

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Janeway lesion

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(jān′wā″) [Edward Gamaliel Janeway, U.S. physician, 1841–1911] A small, painless, red-blue macular lesion a few millimeters in diameter, found on the palms and soles in patients with subacute bacterial endocarditis. SEE: Osler nodes; Roth spots.

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janiceps

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(jăn′ĭ-sĕps) [L. Janus, a two-faced god, + caput, head] A deformed embryo having a face on both the anterior and the posterior aspects of the single head.

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Jansky-Bielschowsky syndrome

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(jăn′skē-bē-ăl-show′skē) [Jan Jansky, Czech physician, 1873–1921; Max Bielschowsky, Ger. neuropathologist, 1869–1940] ABBR: CLN2. A neuronal ceroid lipofuscinosis that ...

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