Exam 3: Mediastinum Part 2
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Where does the thoracic duct begin?
at aortic hiatus
Which mediastinum does the thoracic duct pass through?
posterior and superior mediastinum
What is the thoracic duct continuous with?
What is the cisternal chyli?
- enlarged structure at beginning of thoracic duct
- lymphatic structure in abdomen just inferior to diaphragm
Where is the thoracic duct located?
between aorta and azygos vein
Where does the thoracic duct ascend?
on right side of aorta to T4 vertebra, then crosses to left side of vertebral column to pass posterior to esophagus and aorta
Where does the thoracic duct join the cardiovascular system?
- at junction of left subclavian and left internal jugular veins
- where left brachiocephalic vein begins
What does the thoracic duct drain?
- thoracic wall
- respiratory diaphragm
- everything inferior to respiratory diaphram
Everything below the diaphragm drains to what before entering the thoracic duct?
Which of the splanchnic nerves is contained in the posterior mediastinum?
greater splanchnic nerve
Where do the internal thoracic lymph vessels run?
parallel to sternum
What do the internal thoracic lymph vessels drain?
anterior thoracic wall (intercostal spaces and breasts)
Where do the bronchomediastinal lymph trunks drain lymph from?
- trachea and bronchi
Where are the vagus nerves?
descend in thorax posterior to roots of lungs
What structure does the left recurrent laryngeal nerve loop around to ascend through thoracic inlet to reach larynx?
What do the vagus nerves give branches to?
pulmonary and cardiac plexus
What does the esophageal plexus form from?
What does the esophageal plexus give rise to?
- left vagal trunk
- right vagal trunk
Where is the left vagal trunk?
appears on anterior surface of esophagus
Where is the right vagal trunk?
appears on posterior surface of esophagus
What do the anterior and posterior vagal trunks pass through to enter the abdomen?
Where do the splanchnic nerves originate?
from sympathetic chain ganglia
Are the splanchnic nerves in the thorax parasympathetic or sympathetic?
What kind of fibers make up the splanchnic nerves?
preganglionic sympathetic fibers
Where does the greater splanchnic nerve originate?
T5-9 chain ganglia
Where does the lesser splanchnic nerve originate?
T10-11 chain ganglia
Where does the least (lowest) splanchnic nerve originate?
T12 chain ganglion
What is the only splanchnic nerve in the posterior mediastinum?
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