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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 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.
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 cingulate gyrus commences below the rostrum of the corpus callosum, curves around in front of the genu, extends along the upper surface of the body, and finally turns downward behind the splenium, where it is connected by a narrow isthmus with the parahippocampal gyrus.
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 palatine tonsils are located in the isthmus of the fauces, between the palatoglossal arch and the palatopharyngeal arch of the soft palate.. The palatine tonsil is one of the mucosa-associated lymphoid tissues (MALT), located at the entrance to the upper respiratory and gastrointestinal tracts to protect the body from the entry of exogenous material through mucosal sites.
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]