Thoracic Cavity 2 Flashcards
Describe the location of the trachea and what levels the carina moves to during respiration
The trachea starts at C6 vertebra and ends at the bifurcation at the carina (T4). During respiration the carina can move to as low as T6 and high as T4
At the level of T3, what structures are viable in a transverse plane?
The brachiocephalic trunk, left common carotid, left subclavian, the brachiocephalic veins and trachea, oesophagus, nerves ect.
At the level of T4 what are the structures visable in z transverse plane?
Aortic arch, SVC, arch of azygos, trachea, oesophagus and nerves
What is posterior to the sternoclavicular joint?
v - Formation of brachiocephalic veins from the internal jugular and subclavian vein.
a - Division of the brachiocephalic trunk into right common carotid and right subclavian a.
What is posterior to the 1st right costal cartilage?
Formation of superior vena cava from the right and left brachiocephalic veins
What is posterior to the 2nd right costal cartilage
Arch of azygos vein joins SVC
What is posterior to the 3rd right costal cartilage?
SVC enters right atrium
What is the posterior wall of the posterior mediastinum made up of?
Vertebral bodies, Posterior costal segments, Proximal segments posterior IC vessels, Proximal segments of IC nerves, and the sympathetic chain with ganglia.
Describe how the thoracic aorta forms the abdominal aorta
At the sternal angle the thoracic aorta forms, it lies to the left of thoracic vertebrae but move to the midline in lower thorax. It passes through the diagram behind the oesophagus at T12
What are the visceral branches of the thoracic aorta?
These supply the organs of mediastinum: Osophageal arteries, Bronchial arteries, Pericardial branches, Mediastinal branches and superior phrenic artery (classes as parietal as well)
What are the parietal branches of the thoracic aorta?
Posterior intercostal arteries, subcostal arteries and (superior phrenic artery)
Where does the oesophagus start and peirce the diaphragm?
Starts at C6, descends between vertebral column and trachea then pierces the diaphragm at T10
Describe what type of muscle is the oesophagus made up off?
Upper 1/3 - straited and voluntary. Middle 1/3rd is mix of smooth and striated. Lower 1/3rd is smooth
Name the 4 constrictions of the oesophagus
Upper oesophageal sphincter, where it is crossed by arch of aorta, where is is compressed by the left main bronchus and at the diaphragm. (left atrium causes narrowing)
What is are the clinical significance of the 4 oesophageal constrictions?
They are more likely to cause a blockage, hinder the passage of instruments and slow down the passage of caustic substances leading to more damage.