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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 sandy isthmus or tombolo "The Neck" connects North and South Bruny Island in Tasmania, Australia. An isthmus (/ ˈ ɪ s m ə s, ˈ ɪ s θ m ə s /; [1] pl.: isthmuses or isthmi) [2] is a narrow piece of land connecting two larger areas across an expanse of water by which they are otherwise separated. [3]
The fauces, isthmus of fauces, or the oropharyngeal isthmus is the opening at the back of the mouth into the throat. [1] It is a narrow passage between the velum and the base of the tongue . [ 2 ]
The lower two thirds of the lobes are connected by a thin band of tissue called the isthmus (pl.: isthmi). Microscopically, the functional unit of the thyroid gland is the spherical thyroid follicle , lined with follicular cells (thyrocytes), and occasional parafollicular cells that surround a lumen containing colloid .
The final section of the aortic arch is known as the aortic isthmus. This is so called because it is a narrowing of the aorta as a result of decreased blood flow when in foetal life. [13] As the left ventricle of the heart increases in size throughout life, the narrowing eventually dilates to become a normal size.
This list of isthmuses is an appendix to the article isthmus.The list is sorted by the region of the world in which the isthmus is located. 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.
The isthmus (also called the central pancreas) is the region of the gland that runs anterior to the superior mesenteric artery; by convention, it divides the right and left sides of the pancreas. [ 2 ]
The uterine isthmus is the inferior-posterior part of uterus, on its cervical end — here, the uterine muscle is narrower and thinner. It connects the body and cervix. [1] The uterine isthmus can become more compressibile in pregnancy, which is a finding known as Hegar's sign.