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In anatomy, isthmus refers to a constriction between organs. This is a list of anatomical isthmi: Aortic isthmus, section of the aortic arch. Cavo-tricuspid isthmus of the right atrium of the heart, a body of fibrous tissue in the lower atrium between the inferior vena cava, and the tricuspid valve. Isthmus, the ear side of the eustachian tube.
The thyroid gland is composed of two lobes that are usually connected by a narrow centrally-located tissue band called the isthmus. The isthmus is adherent to the upper anterior aspect of the trachea (Read more!) and is placed anterior to the second and third (or fourth) tracheal rings.
An isthmus (/ ˈ ɪ s θ m ə s / or / ˈ ɪ s m ə s /; plural: isthmuses, or occasionally isthmi; from Ancient Greek: ἰσθμός, romanized: isthmos, lit. 'neck') is a narrow piece of land connecting two larger areas across an expanse of water that otherwise separates them. [ 1 ]
The medial region, called the isthmus, is flanked by wing-shaped left and right lobes. Each of the thyroid lobes are embedded with parathyroid glands, primarily on their posterior surfaces. The tissue of the thyroid gland is composed mostly of thyroid follicles.
The isthmus of the fauces or the oropharyngeal isthmus is a part of the oropharynx directly behind the mouth cavity, bounded superiorly by the soft palate, laterally by the palatoglossal arches, and inferiorly by the tongue.
25 lip 2012 · I found this definition for isthmus online on dictionary.com: a connecting, usually narrow, part, organ, or passage, especially when joining structures or cavities larger than itself. In the case of canal anatomy, we're referring to a narrow band of tissue connecting two canals.
The isthmus (isthmus gl. thyreoidea) 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.
