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The ascending aorta (AAo)[1] is a portion of the aorta commencing at the upper part of the base of the left ventricle, on a level with the lower border of the third costal cartilage behind the left half of the sternum.
| Ascending aorta | |
|---|---|
 The ascending aorta and aortic arch with their branches | |
 Course of the ascending aorta (anterior view), as it passes dorsally to the pulmonary trunk but ventrally to the right pulmonary artery. | |
| Details | |
| Precursor | Truncus arteriosus |
| Source | Left ventricle |
| Branches | Left coronary artery, right coronary artery and continues as the aortic arch |
| Vein | Combination of superior and inferior vena cava and coronary sinus |
| Supplies | The entire body, with exception of the respiratory zone of the lung |
| Identifiers | |
| Latin | aorta ascendens, pars ascendens aortae |
| TA98 | A12.2.03.001 |
| TA2 | 4176 |
| FMA | 3736 |
| Anatomical terminology | |
Structure
editIt passes obliquely upward, forward, and to the right, in the direction of the heart's axis, as high as the upper border of the second right costal cartilage, describing a slight curve in its course, and being situated, about 6 centimetres (2.4 in) behind the posterior surface of the sternum. The total length is about 5 centimetres (2.0 in).
Components
editThe aortic root is the portion of the aorta beginning at the aortic annulus and extending to the sinotubular junction. It is sometimes regarded as a part of the ascending aorta,[2] and sometimes regarded as a separate entity from the rest of the ascending aorta.[3]
Between each commissure of the aortic valve and opposite the cusps of the aortic valve, three small dilations called the aortic sinuses.
The sinotubular junction is the point in the ascending aorta where the aortic sinuses end and the aorta becomes a tubular structure.
Size
editA thoracic aorta diameter greater than 3.5 cm is generally considered dilated, whereas a diameter greater than 4.5 cm is generally considered to be a thoracic aortic aneurysm.[4] Still, the average diameter in the population varies by for example age and sex. The upper limit of standard reference range of the ascending aorta may be up to 4.3 cm among large, elderly individuals.[5]
Relations
editAt the union of the ascending aorta with the aortic arch the caliber of the vessel is increased, owing to a bulging of its right wall.
This dilatation is termed the bulb of the aorta, and on transverse section presents a somewhat oval figure.
The ascending aorta is contained within the pericardium, and is enclosed in a tube of the serous pericardium, common to it and the pulmonary artery.
The ascending aorta is covered at its commencement by the trunk of the pulmonary artery and the right auricula, and, higher up, is separated from the sternum by the pericardium, the right pleura, the anterior margin of the right lung, some loose areolar tissue, and the remains of the thymus; posteriorly, it rests upon the left atrium and right pulmonary artery.
On the right side, it is in relation with the superior vena cava and right atrium, the former lying partly behind it; on the left side, with the pulmonary artery.
Branches
editThe only branches of the ascending aorta are the two coronary arteries which supply the heart; they arise near the commencement of the aorta from the aortic sinuses which are opposite the aortic valve.
Clinical significance
editPorcelain aorta is extensive atherosclerotic calcification of the ascending aorta.[6] It makes aortic surgery difficult, especially aortic cross-clamping, and incisions may result in excessive aortic injury and/or arterial embolism.[6]
The ascending aorta segment is of significant due to its susceptibility to aortic dissection, two times more than in the descending aorta. Early detection of dissection is critical because it allows for prompt intervention to prevent potentially life-threatening complications.[7]
Diagnostics
editDiagnostic methods such as echocardiography, magnetic resonance imaging (MRI) and computed tomography (CT) scans, often with contrast enhancement, are used in the detection of pathology and evaluation of ascending aorta.
Images
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Front view of heart and lungs. -
The arch of the aorta, and its branches. -
Fetal ascending aorta -
Ascending aorta -
Ascending aorta -
Ascending aorta -
Ascending aorta -
Ascending aorta -
Ascending aorta -
Ascending aorta
References
edit
This article incorporates text in the public domain from page 545 of the 20th edition of Gray's Anatomy (1918)
- ^ Logan, Carolynn M.; Rice, M. Katherine (1987). Logan's Medical and Scientific Abbreviations. Philadelphia: J. B. Lippincott Company. p. 3. ISBN 0-397-54589-4.
- ^ Nataf, P (2006). "Dilation of the thoracic aorta: medical and surgical management". Heart. 92 (9): 1345–1352. doi:10.1136/hrt.2005.074781. ISSN 1355-6037. PMC 1861150. PMID 16908722.
- ^ Freeman, Laura A.; Young, Phillip M.; Foley, Thomas A.; Williamson, Eric E.; Bruce, Charles J.; Greason, Kevin L. (2013). "CT and MRI Assessment of the Aortic Root and Ascending Aorta". American Journal of Roentgenology. 200 (6): W581–W592. doi:10.2214/AJR.12.9531. ISSN 0361-803X. PMID 23701088.
- ^ Bret P Nelson (October 1, 2015). "Thoracic Aneurysm". Medscape. Retrieved April 16, 2017.
- ^ Wolak, Arik; Gransar, Heidi; Thomson, Louise E.J.; Friedman, John D.; Hachamovitch, Rory; Gutstein, Ariel; Shaw, Leslee J.; Polk, Donna; Wong, Nathan D.; Saouaf, Rola; Hayes, Sean W.; Rozanski, Alan; Slomka, Piotr J.; Germano, Guido; Berman, Daniel S. (2008). "Aortic Size Assessment by Noncontrast Cardiac Computed Tomography: Normal Limits by Age, Gender, and Body Surface Area". JACC: Cardiovascular Imaging. 1 (2): 200–209. doi:10.1016/j.jcmg.2007.11.005. ISSN 1936-878X. PMID 19356429.
- ^ a b Van Mieghem, Nicolas M.; Van Der Boon, Robert M.A. (2013). "Porcelain Aorta and Severe Aortic Stenosis: Is Transcatheter Aortic Valve Implantation the New Standard?". Revista Española de Cardiología (English Edition). 66 (10): 765–767. doi:10.1016/j.rec.2013.05.008. ISSN 1885-5857. PMID 24773854.
- ^ "Aortic Dissection: Causes, Symptoms & Treatments". Cleveland Clinic. Retrieved March 12, 2024.
