Thyroid isthmus

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Thyroid isthmus
Gray1174.png
The thyroid gland and its relations. (Isthmus visible at center.)
Latin isthmus glandulae thyroideae
Gray's subject #272 1270
Dorlands/Elsevier i_14/12462815

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Overview

The thyroid isthmus connects together the lower thirds of the lobes; it measures about 1.25 cm. in breadth, and the same in depth, and usually covers the second and third rings of the trachea.

Its situation and size present, however, many variations.

In the middle line of the neck it is covered by the skin and fascia, and close to the middle line, on either side, by the Sternothyreoideus.

Across its upper border runs an anastomotic branch uniting the two superior thyroid arteries; at its lower border are the inferior thyroid veins.

Sometimes the isthmus is altogether wanting.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.



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