isthmus

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isthmus

(ĭs`məs), narrow neck of land connecting two larger land areas. Since it commands the only land route between two large areas and is on two seas, an isthmus has great strategical and commercial importance and is a favorable situation for a city. In modern times many isthmuses have been cut through by canals to eliminate the necessity of land transport. The most important isthmuses are the Isthmus of Panama, connecting Central and South America, and the Isthmus of Suez, joining Asia and Africa. Canals were dug through both of these. The Isthmus of Corinth between the Morea peninsula and central Greece also has a canal.

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.

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)

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
References in periodicals archive ?
A transthoracic echocardiogram was done which showed biatrial dilatation, right ventricular dilatation, slightly decreased left ventricular systolic function, severe aortic regurgitation, a possible bicuspid aortic valve with vegetation, an enlarged aortic root, severe tricuspid regurgitation with moderate to severe pulmonary hypertension, tricuspid valve vegetation, a possible non coronary sinus of Valsalva aneurysm with perforation to the right atrium and severe coarctation at the aortic isthmus with a maximum peak gradient of 77 mmHg (Figure 1).
On CT scan of chest and abdomen, with contrast, he was found to have a right pulmonary contusion, a low-grade splenic laceration, a mesenteric hematoma, and a descending aortic isthmus injury.