Johann Friedrich Meckel

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Meckel, Johann Friedrich

 

Born Oct. 17, 1781, in Halle, Saxony; died there Oct. 31, 1833. German biologist.

Meckel studied in Halle, Göttingen, Würzburg, and Vienna. In 1808 he became a professor at Halle. His principal works deal with comparative vertebrate morphology. Meckel was one of the creators of the theory that individual development in extant higher animals passes through stages similar to the adult states of extant lower animals. Meckel described a number of morphological formations, which are named for him. In 1812 he translated into German K. F. Wolffs On the Formation of the Intestinal Tract in the Chick (1768), which advanced the dissemination of his theory of epigenesis.

WORKS

Beiträge zur vergleichenden Anatomic, 2 vols. Leipzig, 1811.
System der vergleichenden Anatomie, 5 vols. Halle, 1821–33.
References in periodicals archive ?
using technetium-99m pertechnetate (Meckel's scan [2]) is considered as the method of choice for the preoperative diagnosis of Meckel's diverticulum.
Technetium-99m pertechnetate scan (Meckel's scan) is currently the standard noninvasive method for preoperative diagnosis of MD in children with lower GI hemorrhage, with a sensitivity of 85% and specificity of 95% [4].
The main diagnostic tests include Meckel's scan and DBE.
When her condition had further stabilized, examinations to determine the cause of hematochezia were performed, starting with Meckel's scan. Five minutes after injection of Tc-99m, continuous uptake was observed in the right mid-abdomen, consistents with Meckel's diverticulum [Figure 1]a, and computed tomography revealed a suspicious enhancing cystic structure at the ileum, which was also consistent with Meckel's diverticulum [Figure 1]b.
Among the medical procedures where Tc-99m is used are: Lung Scintigraphy Tc-99m Pertechnetate for Meckel's scan; Tc-99m Labelled RBC's for Gastro-intestinal Bleeding, Gastroesophageal Reflux (GER) and Gastric Emptying Time (GET); Continuous Ambulatory Peritoneal Dialysis; Liver scan; Liver SPECT scan; Hepatobiliary; Renal Scintigraphy; DMSA Renal scan; DTPA Renal scan with In-Vitro Test; Diuretic Renal scan with In-Vitro Test; Captopril Pre and Post DTPA; Glomerular Filtration Rate (GFR) with in-Vitro test; Renal scan MAG 3; Renal SPECT scan; and Bone Scintigraphy.
When Meckel's scan is non-diagnostic or in patients with non-bleeding presentations, ultrasonography is perhaps the most useful non-invasive method of reaching a diagnosis (Daneman et al., 1998).
A Meckel's scan was performed using 5.39 mCi of technetium (Tc)-99m pertechnetate intravenously.
(4) The Tc99 Meckel's scan has a reported sensitivity of 81 to 90%.