Mediastinum Flashcards
The mediastinum contains essentially all thoracic viscera and structures except for ______
The mediastinum contains essentially all thoracic viscera and structures except for LUNGS
Boundaries of the Superior Mediastinum
Superior Mediastinum Contents?
- Brachiocephalic veins
- Superior vena cava
- Arch of aorta (+ 3 large branches)
Brachiocephalic (BC) Veins
- Formed posterior to the _______________
- Formed by the union of __________and _________ veins
- Lie ___________ to arteries
- _________ is more than twice as long as _______
- Both unite at level of 1st costal cartilage on right to form the ______________
Brachiocephalic (BC) Veins
- Formed posterior to the sternoclavicular joint
- Formed by union of internal jugular and subclavian veins
- Lie anterior to arteries
- Left is more than twice as long as right
- Both unite at level of 1stcostal cartilage on right to form the superior vena cava (SVC)
Superior Vena Cava (SVC)
______________ at CC1
______________ at CC2
______________at CC3
Superior Vena Cava (SVC)
- Formed at the level of CC1
- Receives azygos vein –CC2
- Enters right atrium at CC3
Superior Vena Cava (SVC) is separated from pleura by ____________ laterally
Superior Vena Cava (SVC) is separated from pleura by right phrenic nerve laterally
“________________ keeps the diaphragm alive”
“C3,4 and 5 keeps the diaphragm alive”
Branches of the Aortic Arch?
Brachiocephalic trunk Divides into:
–Right subclavian artery (supplies right upper limb)
–Right common carotid artery (supplies right head & neck)
Left common carotid Artery –Supplies left side of head & neck
Left subclavian Artery –Supplies left upper limb
Azygos= ________
Azygos= “unpaired”
Anterior Mediastinum Contents?
Anterior Mediastinum Contents:
–Thymus gland
–Connective tissue/fat
–Lymph nodes
MIddle Mediastinum Contents
Middle Mediastinum Contents:
–Roots of great vessels
–Ascending aorta
–Lower SVC
–Pulmonary trunk/arteries
–Pulmonary veins
–Main bronchi
–Phrenic nerves
–*Heart & pericardium
Posterior Mediastinum Contents?
Posterior Mediastinum Contents:
–Thoracic aorta
–Azygos & hemiazygos veins
–Thoracic duct
–Posterior mediastinal lymph nodes
–Oesophagus & oesophageal plexus
–Sympathetic trunks
_________________ forms important collateral pathway between Inferior vena cava and Superior vena cava
Major veins in system?
Azygos System of Veins forms important collateral pathway between Inferior vena cava, and Superior vena cava
Major veins in system:
- Azygos vein (right)
- Hemiazygos & accessory hemiazygosveins (left)
