Mediastinum and Respiratory Flashcards

1
Q

What separates the inferior and superior mediastinum?

A

The horizontal plane between the sternal angle and intervertebral disc of T4 and T5.

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2
Q

What is found in the retrosternal superior mediastinum?

A

Great vessels and the thymus

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3
Q

What is found in the prevertebral superior mediastinum?

A
  • Trachea
  • esophagus
  • thoracic duct
  • sympathetic trunk
  • vagus nerves
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4
Q

What is found in the anterior inferior mediastinum ?

A
  • Thymus
  • fat
  • lymph nodes
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5
Q

What is found in the middle inferior mediastinum?

A
  • Pericardium
  • phrenic nerves
  • pericardiacophrenic artery
  • heart
  • great vessels
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6
Q

What is found in the posterior inferior mediastinum?

A
  • esophagus
  • thoracic duct
  • aorta and branches
  • vagus nerves
  • sympathetic trunks
  • azygos veins
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7
Q

Where is the thymus found and what is its innervation and blood supply?

A
  • It is found behind the manubrium covered by the pleura of the lungs.
  • Blood supply is the anterior mediastinal artery from the internal thoracic artery, and inferior thyroid
  • Parasymphathetic comes from vagus
  • Sympathetic comes from the cardiac sympathetic plexus
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8
Q

What is the transverse sinus?

A

The space between arterial and venous mesocardium

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9
Q

What is the oblique sinus?

A

space between right and left pulmonary veins

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10
Q

What ligament fuses with the sternum?

A

Pericardiacophrenic ligament

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11
Q

What fuses with the central tendon of the diaphragm?

A

The fibrous pericardium

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12
Q

Blood supply and innervation to the pericardium?

A
  • Pericardial arteries
  • Pericardiacophrenic arteries
  • Musculophrenic arteries
  • Vagus
  • Phrenic nerve
  • Sympathetic trunk
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13
Q

How does the esophagus pass thorugh the diaphragm?

A

To the left of the midline

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14
Q

Blood supply to the esophagus

A

Bronchial artery

thoracic aorta

left gastric artery

left inferior phrenic artery

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15
Q

Esophagus innervation?

A

Innervated by the esophageal plexus which is a continuation of the posterior pulmonary plexus formed by the right and left vagus nerves

  • Upper 1/3 innervated by the recurrent laryngeal nerve voluntary muscle
  • Vagus and sympathetic chain involunatary muscle
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16
Q
A
17
Q

Where does the thoracic aorta begin and end?

A

Begins at T4 and ends at T12

18
Q

What union forms the Azygos vein?

A

Right ascending lumbar and right subcostal vein

19
Q

What side is does the azygos vein run down?

A

Right side of the thoracic vertebra

20
Q

What forms the hemiazygos vein?

A

Left ascending lumbar and subcostal vein

21
Q

Where does the hemiazygos vein run?

A

Left side of vertebra to T9

22
Q

Describe how the left thoracic duct travels?

A

Begins at T12 or L1 and runs along the right to the midline up through the thoracic region along front of vertebral column and then moves to the left of the midline when it reaches T5.

23
Q

Where does the left thoracic duct receive drainage from?

A
  • Left side of thoracic cavity and part of right
  • Internal jugular lymph trunk
  • Left subclavian lymph trunk
24
Q

What does the right thoracic duct drain?

A
  • Upper right thracic cavity
  • right upper extremity
  • right side of head and neck
25
Q

What are the largest lymph nodes in the body?

A
  • Paratracheal
  • Superior tracheobronchial
  • Inferior tracheobronchial
  • Bronchopulmonary
  • Pulmonary
26
Q

What are the splanchnic nerves formed from?

A

Preganglionic fibers and visceral sensory fibers

27
Q

Where does the greater splanchnic nerve synapse?

A

Celiac ganglion

28
Q

Where does the lesser splanchnic nerve synapse?

A

Superior mesenteric ganglion

29
Q

Where does the least splanchnic nerve synapse?

A

Aorticorenal ganglion

30
Q

What is the only nerve to pass anterior to pulmonary root on each side?

A

Phrenic nerve

31
Q

What nerve is the sole innervation to the diaphragm?

A

Phrenic

32
Q

What is the central tendon?

A

pulls the fibers of the diaphragm to form a dome shaped muscle, it is attached to lumbar vertebra through the crura

33
Q

T or F: The diaphragm creates positive pressure in the thoracic cavity and negative pressure in the abdominal?

A

False. Negative in thoracic positive in abdomen

34
Q

What travels through the caval foramen and where is it located?

A
  • Inferior vena cava and right phrenic nerve
  • T8
35
Q

What is the esophageal hiatus and location?

A
  • Where the esophagus and vagus nerve travel through the diaphragm
  • T10
36
Q

What is the aortic hiatus and where is it located?

A
  • where aorta and greater splanchnic nerve travel through diaphragm
37
Q
A