Thoracic Cavity 2 Flashcards

1
Q

Describe the location of the trachea and what levels the carina moves to during respiration

A

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

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2
Q

At the level of T3, what structures are viable in a transverse plane?

A

The brachiocephalic trunk, left common carotid, left subclavian, the brachiocephalic veins and trachea, oesophagus, nerves ect.

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3
Q

At the level of T4 what are the structures visable in z transverse plane?

A

Aortic arch, SVC, arch of azygos, trachea, oesophagus and nerves

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4
Q

What is posterior to the sternoclavicular joint?

A

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.

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5
Q

What is posterior to the 1st right costal cartilage?

A

Formation of superior vena cava from the right and left brachiocephalic veins

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6
Q

What is posterior to the 2nd right costal cartilage

A

Arch of azygos vein joins SVC

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7
Q

What is posterior to the 3rd right costal cartilage?

A

SVC enters right atrium

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8
Q

What is the posterior wall of the posterior mediastinum made up of?

A

Vertebral bodies, Posterior costal segments, Proximal segments posterior IC vessels, Proximal segments of IC nerves, and the sympathetic chain with ganglia.

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9
Q

Describe how the thoracic aorta forms the abdominal aorta

A

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

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10
Q

What are the visceral branches of the thoracic aorta?

A
These supply the organs of mediastinum:
Osophageal arteries,
Bronchial arteries,
Pericardial branches, 
Mediastinal branches and superior phrenic artery (classes as parietal as well)
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11
Q

What are the parietal branches of the thoracic aorta?

A

Posterior intercostal arteries, subcostal arteries and (superior phrenic artery)

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12
Q

Where does the oesophagus start and peirce the diaphragm?

A

Starts at C6, descends between vertebral column and trachea then pierces the diaphragm at T10

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13
Q

Describe what type of muscle is the oesophagus made up off?

A

Upper 1/3 - straited and voluntary. Middle 1/3rd is mix of smooth and striated. Lower 1/3rd is smooth

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14
Q

Name the 4 constrictions of the oesophagus

A

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)

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15
Q

What is are the clinical significance of the 4 oesophageal constrictions?

A

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.

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16
Q

Describe the venous drainage of the oesophagus

A

upper and middle 3rd - azygos/hemiazygos/accessory hemiazygos. While lower 3rd goes to left gastric vein (portal system)

17
Q

What is the anstamoses between middle and lower thirds of oesophagus?

A

Portocaval anastamosis

18
Q

Describe the nerve supply of the oesophagus

A

Left vagus nerve (turns into anterior vagus trunk), right vagus nerve (turns into posterior vagus trunk)

19
Q

What nerve fibres form the oesophageal plexus?

A

The anterior vagus trunk and the posterior vagus trunk.

20
Q

Name the mediastinal lymph nodes

A

Superior and inferior tracheobronchial nodes (receives lymph from lungs - metastasis) and the anterior mediastinal lymph nodes (around brachiocephalic veins) and posterior mediastinal lymph nodes (behind heart)

21
Q

Describe the lymphatic drainage of the mediastinal lymph nodes

A

Posterior mediastinal lymph nodes drain to the paratracheal then to the bronchomediastinal lymph trunk. The anterior mediastinal lymph drains straight to the bronchomedisatinal lymph trunk

22
Q

Describe the lymphatic drainage of the left upper body.

A

The left jugular lymph trunk (LT), the left subclavian LT and the left bronchomediastinal trunk all drain to the thoracic druct which drains into the left brachiocephalic vein at pirogoffs angle

23
Q

Describe the lymphatic drainage of the right upper body

A

The right jugular LT, right subclavian LT and the right bronchomediastinal trunk all drain into the right lymphatic duct which drains into the right brachiocephalic vein.

24
Q

Describe the function of the thoracic duct

A

Carries lymph from all the body except thorax, and UL, neck and head from right side, stating from the cisterna chyli. The pulsation of the aorta promotes lymph flow.

25
Q

What is the clinical significance of the thoracic duct

A

Lymphatic fluid can leak from the thoracic duct resulting in a chylothorax which is where lymphatic fluid enters the pleural cavity