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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.
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6 lis 2024 · Structure and Anatomy Overview. The thyroid gland is a highly vascular, butterfly-shaped endocrine gland located in the anterior region of the neck. It is composed of two lateral lobes, right and left, connected by a thin band of tissue called the isthmus. The thyroid gland is covered by a fibrous capsule and is anchored to surrounding ...
An isthmus ( / ˈɪsθməs / or / ˈɪsməs /; 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] A tombolo is an isthmus that consists of a spit or bar.
28 kwi 2024 · The mouth anatomy has two main parts: the vestibule and the oral cavity. The vestibule is the area between the teeth and the lips, while the oral cavity proper is where the tongue sits and food gets chewed. This space is always a bit wet because of the saliva. It helps with digestion and keeps everything smooth.
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 (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.
