Descending thoracic aorta - wikipedia Descending thoracic aorta Thoracic aorta Schematic view of the aorta and its segments, with Descending thoracic aorta labeled near middle The thoracic aorta, viewed from the left side. Details Source descending aorta Branches bronchial arteries, esophageal arteries, posterior intercostal arteries, abdominal aorta, superior phrenic artery, pericardial arteries Identifiers Latin pars thoracica aortae, aorta thoracalis MeSH D001013 TA A12. 2.11. 001 FMA 3786 Anatomical terminology ( edit on Wikidata ) The descending thoracic aorta is a part of the aorta located in the thorax. It is a continuation of the descending aorta and contained in the posterior mediastinal cavity. The descending thoracic aorta begins at the lower border of the fourth thoracic vertebra where it is continuous with the aortic arch, and ends in front of the lower border of the twelfth thoracic vertebra, at the aortic hiatus in the diaphragm where it becomes the abdominal aorta. At its commencement, it is situated on the left of the vertebral column ; it approaches the median line as it descends ; and, at its termination, lies directly in front of the column. The descending thoracic aorta has a curved shape that faces forward, and has small branches. It has a radius of approximately 1.16 cm. Contents 1 Structure 2 Function 3 Clinical significance 4 Additional images 5 References 6 External links Structure Main article : Aorta The descending thoracic aorta is part of the aorta, which has different parts named according to their structure or location. The descending thoracic aorta is a continuation of the descending aorta and becomes the abdominal aorta when it passes through the diaphragm. The initial part of the aorta, the ascending aorta, rises out of the left ventricle, from which it is separated by the aortic valve. The two coronary arteries of the heart arise from the aortic root, just above the cusps of the aortic valve. The aorta then arches back over the right pulmonary artery. Three vessels come out of the aortic arch : the brachiocephalic artery, the left common carotid artery, and the left subclavian artery. These vessels supply blood to the head, neck, thorax and upper limbs. Behind the descending thoracic aorta is the vertebral column and the hemiazygos vein. To the right is the azygos veins and thoracic duct, and to the left is the left pleura and lung. In front of the descending thoracic aorta lies the root of the left lung, the pericardium, the esophagus, and the diaphragm. The esophagus, which is covered by a nerve plexus lies to the right of the descending thoracic aorta. Lower, the esophagus passes in front of the aorta, and ultimately is situated on the left. Function The aorta is an artery that conveys oxygenated blood from the heart to other parts of the body. It is one of the largest arteries in the body. The aorta gives off several paired branches as it descends. In descending order, these include the Bronchial arteries Mediastinal arteries Esophageal arteries Pericardial arteries Superior phrenic arteries Note : The posterior intercostal arteries are branches that originate throughout the length of the posterior aspect of the descending thoracic aorta. Clinical significance Histopathological image of dissecting aneurysm of descending thoracic aorta in a patient without evidence of Marfan 's trait. The damaged aorta was surgically removed and replaced by artificial vessel. Victoria blue & HE stain. Aortic dissection Additional images Transverse section of thorax, showing relations of pulmonary artery. The arch of the aorta, and its branches. Schematic of the thoracic aorta, showing major branches References This article incorporates text in the public domain from page 598 of the 20th edition of Gray 's Anatomy ( 1918 ) Jump up ^ Solutions to the Van der Pol Equation : a Model of Aortic Blood Flow External links UCC Arteries of the torso and chest Lungs Pulmonary artery Right Left ( Ligamentum arteriosum ) Heart Coronary circulation Right coronary : SA nodal AV nodal Atrial Right marginal Posterior interventricular Left coronary : Anterior interventricular Left circumflex ( Left marginal ) Aorta Sections Ascending aorta Aortic arch Descending aorta Thoracic aorta Abdominal aorta Aortic body Aortic arch Brachiocephalic Thyreoidea ima Right subclavian Right common carotid Left common carotid External carotid Internal carotid Carotid body Carotid sinus Carotid bifurcation Left subclavian Internal thoracic : Anterior intercostal Thymic Pericardiacophrenic Perforating branches terminal ( Musculophrenic, superior epigastric ) Costocervical trunk : Highest intercostal ( Posterior intercostal 1 -- 2 ) Deep cervical Descending aorta visceral : Bronchial Esophageal Mediastinal parietal : Posterior intercostal 3 -- 11 Subcostal Superior phrenic Anatomy portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Descending_thoracic_aorta&oldid=825175576 '' Categories : Wikipedia articles incorporating text from the 20th edition of Gray 's Anatomy ( 1918 ) Aorta Arteries of the thorax Hidden categories : Pages with unresolved properties All articles with unsourced statements Articles with unsourced statements from November 2014 Talk Contents About Wikipedia Azərbaycanca Deutsch ދިވެހިބަސް Euskara Hrvatski Italiano Português Српски / srpski Srpskohrvatski / српскохрватски 3 more Edit links This page was last edited on 11 February 2018, at 22 : 37 ( UTC ). 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Question: where is the descending aorta located in the mediastinum
Answer: posterior mediastinal cavity