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Flashcards in deck_1374064 Deck (43):
1

Describe the surface structure of the lungs

○ An apex ○ Three surfaces: a costal surface, a diaphragmatic surface and a mediastinal surface ○ Three borders § Anterior, inferior, posterior ○ A base ○ Lobes § Two (left lung) or three (right lung) § Created by one or two fissures

2

What is the oblique fissure in the right lung?

• Separates the right upper and middle lobes from the lower lobe of the right lung

3

What is the oblique fissure in the left lung?

Separates the upper and lower lobes

4

What is the horizontal fissure in the right lung?

• Separates the right upper and middle lobes

5

What extends into the fissures of the lungs?

The visceral pleura

6

What do the lungs receive nervous supply from?

• The vagi and sympathetic trunk via the pulmonary plexuses, situated in the hilum

7

What enters the lung through the hilum

• Pulmonary arteries and veins• Bronchial arteries and veins• Nerves• Lymphatics

8

What is the hilum of the lung?

A wedge shaped area on the mediastinal surface of each lung through which structures forming the roots of the lung pass to enter or exit

9

What do the roots of the lung consist of?

• Bronchi• Pulmonary arteries• Superior and inferior pulmonary veins• Pulmonary plexus of nerves• Lymphatics

10

What is the mediastinum?

• The central compartment of the thoracic cavity

11

What is the mediastinum covered by?

• Mediastinal plueura

12

Where does the mediastinum extend to and from?

• Superior thoracic arpeture to the diaphragm• Sternum and costal cartilages anteriorly to the bodies of the thoracic vertebrae posteriorly

13

What two sections is the mediastinum divided into?

• Superior and inferior parts

14

Where does the superior mediastinum extend to and from?

• Superior thoracic aperture to the transverse thoracic plane

15

What is the transverse thoracic plane?

• Horizontal plane that includes the sternal angle anteriorly and passes approximately through the junction of T4 and T5 posteriorly

16

Where does the inferior mediastinum extend to and from?

• Transverse thoracic plane to the diaphragm• Further subdivided by the pericardium ○ Anterior ○ MiddlePosterior

17

Give one structure which lies in more than one compartment of the mediastinum

Oesophagus

18

Where do the pulmonary arteries carry mixed venous blood?

• From the right ventricle for gas exchange at the alveoli

19

What does the main pulmonary artery divide into?

The right and left pulmonary arteries

20

What structure do the pulmonary arteries divide with?

The bronchial tree

21

What do the pulmonary arteries supply?

• The alveoli only

22

Are there any anastamoses between bronchial and pulmonary arteries?

Yes, at pre capillary and capillary level

23

How does the path of the pulmonary veins differ from that of the pulmonary arteries?

• Do not follow divisions of bronchi• Tend to run into intersegmental septa

24

How many pulmonary veins leave each hilum?

• Two

25

What is the name of the two lymphatic plexi that drain the lungs?

• Subpleural lymphatic plexusDeep bronchopulmonary lymphatic plexus

26

What is the diaphragm?

A dome shaped muscle which divides the thoracic cavity from the abdominal cavity.

27

Why is the large size of the diaphragm clinically important, as pertaining to the position of other organs?

• Means kidneys, liver, spleen, parts of the stomach and upper kidneys lie in the abdominal cavity and are covered by the ribs• Lower chest injuries significant

28

Outline the structure of the diaphragm

• A peripheral muscular part and a central tendon

29

What is the peripheral muscular part of the diaphragm made up of?

• The crura tendons which arise from L1-L3• Arcuate ligaments, which are thickening of the fascia

30

What are the three parts of the diaphragm?

• Vertebral arising from the crura and acruate ligaments• Costal part arising from inner aspects of 7-12 costal cartilageSternal part arising from deep surface of xiphissternum

31

What happens if you have cervical spinal damage from C2 downwards

• Severs link to phrenic nerve (C3, C4, C5), so lose function of the diaphgragm

32

What is the phrenic nerve sensory for?

• Both surfaces of diaphragm• Medialstinal part of the pleura • Diaphragmatic part of the parietal pleura

33

What are the three parts of the thoracic cavity?

• Two lateral pulmonary cavities and one central compartment - the mediastinum

34

What compartments is the mediastinum divided up into?

• Superior• Middle• Posterior Inferior

35

What is the purpose of the parietal pleura?

• Secretes fluid, which sticks it to the visceral pleuraThis means everything moves at once

36

What proportion of chest expansion is done by the diaphragm?

70%

37

What proportion of chest expansion is governed by the chest wall?

30%

38

What does inspiration involve?

• Elevation of external intercostal muscles

39

What does inspiration result in?

• Increase in transverse diameter of thoracic cavity• In the A=P diameter of thoracic cavity• Increase in vertical dimension

40

What occurs in expiration?

• In quiet respiration it simply relaxes elastic of chest wall and lungsIn forced expiration, internal and innermost intercostal muscle and abdominal muscle are used

41

What muscles are used in quiet inhalation?

• Diaphragm • External intercostals

42

What muscles does forced inhalation involve? (6)

• Diaphragm• External Intercostals• Scalene• Pectoralis Minor• SternocleidomastoidSerratus Anterior

43

What muscles does forced exhalation involve?

• Internal intercostals• Innermost intercostals• Abdominal muscles