Mediastinum and Respiratory Flashcards
What separates the inferior and superior mediastinum?
The horizontal plane between the sternal angle and intervertebral disc of T4 and T5.
What is found in the retrosternal superior mediastinum?
Great vessels and the thymus
What is found in the prevertebral superior mediastinum?
- Trachea
- esophagus
- thoracic duct
- sympathetic trunk
- vagus nerves
What is found in the anterior inferior mediastinum ?
- Thymus
- fat
- lymph nodes
What is found in the middle inferior mediastinum?
- Pericardium
- phrenic nerves
- pericardiacophrenic artery
- heart
- great vessels
What is found in the posterior inferior mediastinum?
- esophagus
- thoracic duct
- aorta and branches
- vagus nerves
- sympathetic trunks
- azygos veins
Where is the thymus found and what is its innervation and blood supply?
- 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
What is the transverse sinus?
The space between arterial and venous mesocardium
What is the oblique sinus?
space between right and left pulmonary veins
What ligament fuses with the sternum?
Pericardiacophrenic ligament
What fuses with the central tendon of the diaphragm?
The fibrous pericardium
Blood supply and innervation to the pericardium?
- Pericardial arteries
- Pericardiacophrenic arteries
- Musculophrenic arteries
- Vagus
- Phrenic nerve
- Sympathetic trunk
How does the esophagus pass thorugh the diaphragm?
To the left of the midline
Blood supply to the esophagus
Bronchial artery
thoracic aorta
left gastric artery
left inferior phrenic artery
Esophagus innervation?
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