Chapter 8 - Major Vessels of Thorax Flashcards Preview

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Flashcards in Chapter 8 - Major Vessels of Thorax Deck (24)
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1

Origin and course of superior vena cava

- Formed by union of R and L brachiocephalic V
- Begins at lower border of 1st right costal cartilage
- Pierces pericardium opposite 2nd right costal cartilage
- Opens into right atrium behind 3rd right costal cartilage
- No valves

2

Relations of superior vena cava

A:
1. Chest wall
2. Internal thoracic vessels
3. Anterior margin of right lung
P:
1. Trachea
2. Right vagus
3. Root of right lung
M:
1. Ascending aorta
2. Brachiocephalic A
L:
1. Right phrenic N
2. Right pleura

3

Tributaries of superior vena cava

1. Azygos vein joins at level of 2nd costal cartilage
2. Mediastinal V
3. Pericardial V

4

Origin and course of ascending aorta

- From upper end of left ventricle
- Enclosed in pericardium
- Begins at lower border of 3rd costal cartilage
- Runs upward, forward and right
- Continues with aortic arch at upper border of 2nd costal cartilage
- Has 3 dilatations(aortic sinuses): anterior, left posterior, right posterior

5

Relations of ascending aorta

A:
1. Sternum
2. Right lung
3. Infundibulum of right ventricle
4. Pulmonary trunk
5. Right auricle
P:
1. Transverse sinus
2. Left atrium
3. Right pulmonary artery
4. Right bronchus
RIGHT:
1. SVC
2. Right atrium
LEFT:
1. Pulmonary trunk
2. Left atrium

6

Braches of ascending aorta

1. Right coronary A from anterior sinus
2. Left coronary A from left posterior sinus

7

Course of arch of aorta

- Begins at 2nd right costal cartilage
- Runs upward, backward, left
- Arches over root of left lung
- Ends at level of body of T4

8

Relations of aortic arch

ANTERIOR:
1. Left phrenic N
2. Cervical cardiac branch of left vagus N
3. Superior cervical cardiac branch of left sympathetic chain
4. Left vagus N
5. Left superior intercostal V
6. Left lung
POSTERIOR:
1. Trachea
2. Oesophagus
3. Left recurrent laryngeal N
4. Thoracic duct
5. Vertebral column
SUPERIOR:
1. Brachiocephalic A
2. Left common carotid A
3. Left subclavian A
INFERIOR:
1. Left bronchus
2. Bifurcation of pulmonary trunk
3. Ligamentum arteriosum
4. Left recurrent laryngeal N

9

Branches of aortic arch

1. Brachiocephalic A
2. Left common carotid A
3. Left subclavian A

10

Course of descending thoracic aorta

- Lies in posterior mediastinum
- Begins at T4
- Descends with an inclination to right
- Ends at T12

11

Relations of descending thoracic aorta

ANTERIOR:
1. Root of left lung
2. Pericardium, heart
3. Oesophagus
4. Diaphragm
POSTERIOR:
1. Vertebral column
2. Hemiazygos V
RIGHT:
1. Oesophagus
2. Azygos V
3. Thoracic duct
4. Right lung
LEFT:
1. Left lung

12

Branches of descending thoracic aorta

1. 3-11 posterior intercostal A
2. Subcostal A
3. 2 left bronchial A
4. Oesophageal branches
5. Pericardial branches
6. Mediastinal branches
7. Superior phrenic A that anastamose with musculophrenic and pericardiacophrenic A

13

Right phrenic N

- Short, vertical, deep
- Crosses 2nd part of right subclavian A
- Passes through vena caval opening of diaphragm

14

Left phrenic N

- Long, oblique, superficial
- Crosses 1st part of left subclavian A
- Pierces left cupola of diaphragm

15

Pulmonary trunk

- Starts from infundibulum of right ventricle
- Overlaps beginning of ascending aorta
- Divides into R, L pulmonary A at level of sternal angle
- RIGHT PA goes behind ascending aorta and SVC to enter root of right lung
- LEFT PA passes anterior to descending thoracic aorta to enter root of left lung and is connected to ligamentum arteriosus

16

Development of brachiocephalic A

Right aortic sac

17

Development of right subclavian A

Proximal from right 4th aortic arch A
Remaining from right 7th cervical intersegmental A

18

Development of left subclavian A

Left 7th cervical intersegmental A

19

Development of common carotid A

3rd aortic arch

20

Development of external carotid A

3rd aortic arch

21

Development of pulmonary trunk

Truncus arteriosus

22

Development of arch of aorta

Left aortic sac, 4th aortic arch, dorsal aorta

23

Development of SVC

Upper half: caudal part of right anterior cardinal V
Lower half: right common cardinal V

24

Development of coronary sinus

Remnant of left horn of sinus venosus