Week 9: Thorax dissection

Question 1

The intercostal nerves are…. (where are they from)

Answer 1

Ventral rami of thoracic spinal nerves

Question 2

Where do the intercostal arteries come from?

Answer 2

Some from descending thoracic aorta, some from other branches of the aorta

Question 3

What direction do the external intercostal muscles lie in?

Answer 3

Antero inferior direction

Question 4

What are the external intercostal muscles supplied by?

Answer 4

Intercostal nerve

Question 5

Draw the vessels coming off the arch of aorta and SVC

Answer 5

Ok

Question 6

What gives rise to the right coronary artery?

Answer 6

Right aortic sinus

Question 7

What forms the right border of the heart?

Answer 7

Right atrium

Question 8

What forms the left border of the heart?

Answer 8

Left ventricle

Question 9

What lies to the R of the anterior AV sulcus?

Answer 9

Right atrium

Question 10

What lies to the L of the anterior AV sulcus?

Answer 10

R ventricle

Question 11

What receives the coronary sinus?

Answer 11

Right atrium

Question 12

What receives the pulmonary veins?

Answer 12

Left atrium

Question 13

What has 2 papillary muscles?

Answer 13

Left ventricle (mitral valve)

Question 14

What has three papillary muscles?

Answer 14

Right ventricle 3 (tricuspid)

Question 15

What runs in the anterior AV sulcus? Posterior?

Answer 15

Anterior: R coronary artery

Posterior: Circumflex artery

Question 16

What has a rudimentary valve at its right atrial orifice?

Answer 16

IVC

Question 17

What commonly gives rise to the anterior IV artery and the posterior IV artery?

Answer 17

Anterior: L coronary artery
Posterior: R coronary artery

Question 18

What most commonly supplies the AV node?

Answer 18

Right coronary artery

Question 19

What receives the azygos vein?

Answer 19

SVC (azygos arches over right lung root and empties into SVC at the level of the 2nd right costal cartilage)

Question 20

What do the pulmonary arteries carry?

Answer 20

Deoxygenated blood for gas exchange

Question 21

What are bronchial arteries branches of?

Answer 21

Descending thoracic aorta

Question 22

What are anterior and inferior at the hilum of the lung?

Answer 22

Pulmonary veins

Question 23

What are the layers traversed by intercostal drainage?

Answer 23

Skin
Superficial fascia
Pec major/minor OR serratus anterior
External intercostal
Internal intercostal
Innermost intercostal
Parietal pleura
Pleural cavity

Question 24

Where would needle be inserted in the intercostal space?

Answer 24

Lower margin, avoid injury to main intercostal neurovascular bundle

Question 25

Where would you drain a pneumothorax?

Answer 25

2nd IC space in mid clavicular line

or

5th IC space in mid axillary line

Question 26

Where are the 4 sites of constriction of the oesophagus?

Answer 26

Origin
LMB
Aortic arch
Near termination (through diaphragm)

Question 27

Where does lymph from medial breast drain?

Answer 27

Parasternal lymph nodes

Question 28

Where does the phrenic nerve pass through in the diaphragm?

Answer 28

R: IVC opening
L: left dome