Observe the mediastinum Left pulmonary root: superiorly Superior aortic arch left subclavian mediastinum a, thoracic duct Posteriorly anterior mediastinum thoracic aorta 上纵隔 ◆ Right pulmonary root: Superiorly:inf. vena cava, azygos前纵馬 后 纵 v, trachea; posteriorly: azygos v e Postolateral: thoracic sympathetic trunk, greater splanchnic n. post intercostal Midddle blood vessels and nn mediastinum Inferno mediastinum
Left pulmonary root: superiorly: aortic arch,left subclavian a.,thoracic duct.Posteriorly: thoracic aorta Right pulmonary root： Superiorly: inf.vena cava,azygus v,trachea; posteriorly: azygos v. Postolateral：thoracic sympathetic trunk, greater splanchanic n. post.intercostal blood vessels and nn. Observe the mediastinum Superior. mediastinum Inferior mediastinum Midddle mediastinum anterior mediastinum
Mediastinum specimen in adult (left view) anterior branch of 6th cervical n lst rib ertebral a left subclavian a, and v left vagus n. thoracic duct nternal thoracic a. and v supraesophageal trigone irenic a and v arterial lig left recurrent laryngeal n left pulmonary a intercostal a, v and n left superior pulmonary v left principal bronchus left inferior pulmonary v. thoracic sympathetic trunk pericardium accessory hemiazygos v. roots of greater splanchnic n
Mediastinum specimen in adult (left view)
Mediastinum specimen in adult (right view) anterior branch of &th cervical n anterior branch of 6th cervical n right subclavian a ertebral a right ommon carotid a esopha trachea right vagus n internal thoracic a, and v azygos v. pericardiacophrenic a, and v. right superior lobar bronchus superior vena cava right intermediate bronchi right pulmonary a right inferior pulmonary v. right superior pulmonary v. thoracic sympathetic trunk right phrenic n. intercostal a. v and n thoracic duct -6th costal cartilage
Mediastinum specimen in adult (right view)
Dissection of sup. mediastinum Ant layer -thymus and vein layer Three layers Mid layer -arteries nerve layer Post layer -trachea and esophagus Thymus(1)& Three veins(2-4) 2-Left brachiocephalic v 3-Right brachiocephalic v 4-Superior vena cava reht vi要 lell vagus n left subclavian n lett common carotid a left recurrent laryngeal n intemal thorac n antral Iigament monary trunk
Dissection of sup.mediastinum Three layers Ant.layer - thymus and vein layer Mid.layer – arteries & nerve layer Post.layer - trachea and esophagus Thymus(1) & Three veins (2-4) 2-Left brachiocephelic v. 3-Right brachiocephelic v. 4-Superior vena cava 1 1 3 2 4 3 2 4
Superior mediastinum Middle(arterial) layer Posterior(visceral) layer 1-Aortic arch its 3 4-Trachea branches 5-Esophagus 2-Phrenic n 6-Thoracic duct 3-Vagus n 7-Left recurrent laryngeal n right recurrent laryngeal n trachea esophagus trachea ght vagus 3- lett vagus n left subclavian a subclavian a left subclavian a lett common lett recurrent laryngeal n right bronchial a arterial lignment left brachiocephalic v aht principal Intemal thoracic a uperior vena cava left recurrent laryngeal n artenal ligament pulmonary trunk ricardian right inferior ulmonary
Superior mediastinum • Middle(arterial) layer 1-Aortic arch & its 3 branches 2-Phrenic n. 3-Vagus n. • Posterior(visceral) layer 4-Trachea 5-Esophagus 6-Thoracic duct 7-Left recurrent laryngeal n. 1 2 1 1 3 3 4 5