| Jackson's rule | After an epileptic attack, simple and quasiautomatic functions are less affected and more rapidly recovered than the more complex ones. (05 Mar 2000) |
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| Jackson's sign | <clinical sign> During quiet respiration the movement of the paralysed side of the chest may be greater than that of the opposite side, while in forced respiration the paralysed side moves less than the other. Origin: J. H. Jackson (05 Mar 2000) |
| Jackson's veil | A thin vascular membrane or veil-like adhesion, covering the anterior surface of the ascending colon from the caecum to the right flexure; it may cause obstruction by kinking of the bowel. Synonym: Jackson's veil. (05 Mar 2000) |