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Thyroid isthmus

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Title: Thyroid isthmus  
Author: World Heritage Encyclopedia
Language: English
Subject: Thyroid, Levator muscle of thyroid gland, List of anatomical isthmi, Corticotropic cell, Corpora arenacea
Collection: Human Head and Neck, Thyroid
Publisher: World Heritage Encyclopedia

Thyroid isthmus

Thyroid isthmus
The thyroid gland and its relations
(thyroid isthmus visible at center)
Latin Isthmus glandulae thyreoideae
Anatomical terminology

The thyroid isthmus is the part of the thyroid gland that connects together the lower thirds of the right and left lobes of the thyroid gland. The thyroid isthmus measures about 1.25 cm in breadth, and the same in depth, and usually covers the second and third rings of the trachea. There are, however, many variations in its situation and size.

In the middle line of the neck, the thyroid isthmus is covered by the skin and fascia, and close to the middle line, on either side, by the sternothyroid muscles. Across its upper border runs an anastomotic branch uniting the two superior thyroid arteries; at its lower border are the inferior thyroid veins.


External links

  • Anatomy figure: 26:01-07 at Human Anatomy Online, SUNY Downstate Medical Center - "Diagram of the relationship of the thyroid gland to the larynx."
  • lesson5 at The Anatomy Lesson by Wesley Norman (Georgetown University) (antthyroidgland)
  • Diagram (large)
  • Diagram (small)

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