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isthmus

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isthmus

1. a narrow strip of land connecting two relatively large land areas
2. Anatomy
a. a narrow band of tissue connecting two larger parts of a structure
b. a narrow passage connecting two cavities
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

isthmus

[′is·məs]
(biology)
A passage or constricted part connecting two parts of an organ.
(geography)
A narrow strip of land having water on both sides and connecting two large land masses.
(mathematics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Isthmus

 

a relatively narrow strip of land that connects larger land areas, such as two continents (Isthmus of Suez, Isthmus of Panama) or a peninsula and the mainland (Perekop Isthmus). Some isthmuses, such as the Karelian Isthmus, separate two bodies of water.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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References in periodicals archive
The blood supply of the isthmus also has some variability: it may receive blood from the main renal artery, from the abdominal aorta (originating above or below the isthmus), the common iliac artery or the inferior mesenteric artery (Mano et al., 2016).
Europaeus-Ayrapaa presented in his work a three-part classification for the pottery of the Stone Age from Finland and the Karelian Isthmus. The system includes Early (Ka I or Sperrings), Typical (Ka II or TCW) and Late Comb Ware (Ka III or LCW).
Various locations of the base of pyramidal lobe generally require careful dissection of both the pretracheal and the prelaryngeal regions from the upper border of the isthmus up to the upper border of the thyroid cartilage in most of the patients and sometimes up to the hyoid bone.
Long-term outcomes after catheter ablation of cavo-tricuspid isthmus dependent atrial flutter: a metaanalysis.
Although the incidence of thyroid isthmus agenesis has been reported to range between 0.5% and 10%, the precise incidence rate is unknown (4, 5).
* Graft isthmus artery: End-to-end anastomosis to the recipient internal iliac artery.
With regard to unfilled parts of the root canal system, an unfilled isthmus (27.5%), an unfilled main canal (18.8%) or an unfilled isthmus with unfilled canals (11.5%) were the main findings (Table 3).
A hard lump of size 20 x 15 mm and unclear border could be seen on the isthmus of thyroid during surgery.
The winners of the categories 12.6 and 14 will have the unique opportunity to travel for free with Aegean Airlines and take part in the final race of the Seventh Hellenic SUP CUP 2017, the crossing of Isthmus of Corinth.
The association between RAI treatment failure and various clinical parameters including age, sex, height, weight, body mass index (BMI), thyroid gland volume, and isthmus length on ultrasonographic images, thyroid function and thyroid autoantibody levels before treatment, dose of RAI, RAI uptake rate, and serum selenium and 25-hydroxycholecalciferol levels was analyzed.
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