Mediastinum I

Question 1

Borders of superior mediastinum

Answer 1

• sternal angle meeting of T4/T5
• vertebral bodies of T1 through T4
• manubrium of sternum
• sternal notch and first rib

Question 2

Inferior mediastum is divided into

Answer 2

middle
anterior
posterior

Question 3

middle mediastum borders

Answer 3

-7th rib to diaphram to T7-8
-sternal angle to meeting of T4/5
anterior portion of pericardium
posterior portion of pericardium

Question 4

anterior medistum borders

Answer 4

• body of sterum
• dome of diaphragma nd anterior portion of percardium
• xyphoid process
• sternal angle

Question 5

posterior mediastum borders

Answer 5

-posterior portion of pericadium and dome of diaghphram
-bodies of T5-T12
meeting of T4 and T5
bottom of T12

Question 6

superior vena cava is formed by

Answer 6

left and right brachiocephalic veins (these are formed by internal jug and subclaviaN)

Question 7

left brachiocephalic

Answer 7

twice as long as the right

Question 8

what are the 3 branches off of the aorta

Answer 8

brachiocephalic
left common carotid
left subclavian

Question 9

right recurrent

Answer 9

curves under right subclavian

Question 10

left recurrent

Answer 10

travels between trachea and esophagus

Question 11

esophagus

Answer 11

sits posterior to trachea inferior to pharynx

Question 12

thoracic duct

Answer 12

begins with nodes in abdomen around descending aorta. travels up through thorax to cross left side. in neck it drains into left internal jug or left subclavin. drains most of bodies lympathetics

Question 13

phrenic

Answer 13

in middle medistinum
embedding in fibrous pericardium
sensory to central aspect of diaphragm
motor to entire diaphragm

Question 14

where is the aortic arch

Answer 14

in superior mediastium

Question 15

What great vessels are on the superior side

Answer 15

SVC
aorta
pulmonary trunk

Question 16

what great vessel in the inferior side

Answer 16

IVC

Question 17

what great vessel is in the posterior/lateral side

Answer 17

pulmonary veins
primary bronchi
bronchopulmonary (hilar) lymph nodes

Question 18

most prominate structure in posterior mediastum

Answer 18

thoracic aorta

Question 19

mediastimal arteries

Answer 19

supply the interstitial tissue between all structures

Question 20

12th artery

Answer 20

subcostal arery (there is no 12th intercostal space)

Question 21

intercostal nerves

Answer 21

typical spinal nerve

Question 22

cisterna chyli

Answer 22

swelling to the right of aorta at aortic hiatus of diaphragm. drains all lymphatics below diaphragm

Question 23

where does the thoracic duct sit

Answer 23

between esophagus and azogous vein (a duck between two gooses)

Question 24

hemiazygos vein

Answer 24

drains inferior left side of thorax

left 9-11th intercostal veins drain here. Crosses vertebra at T9

Question 25

accesssory hemiazygous

Answer 25

drains most of superior left side. left 4th-8th intercostal veins drain into accessory hemiazygous. crosses vertebra at T8

Question 26

left superior intercostal vein

Answer 26

provides drainage for small portion of left superior thorax
drains into left brachocephalic avein
left 1st-3rd intercostal veins drain here

Question 27

Right superior intercostal vein

Answer 27

drains superior portion of thorax

right 1st-3rd intercostal vein drains here