Lecture 16- lung and chest wall

Question 1

Describe the hilum of the lung?

Answer 1

Arteries, Above. Bronchi Behind. Veins Very low down in front.

Question 2

When the intercostal muscles contract what happens to the rib cage?

1. External intercostals
2. Internal intercostals

Answer 2

1. Rib cage pulls up and out- external
2. Rib cage lowered- internal

Question 3

Which way do the intercostal muscles run?

1. External
2. Internal

Answer 3

1. External- fibres run from outer higher to inner lower. so when they contract it’s up and out. Superolateral to infero-medial.
2. Internal- Outer lower to inner higher. So down when contract. Inferolateral to superomedial.

Question 4

What makes up the neurovascular bundle in the intercostals?

Answer 4

Intercostal vein, intercostal artery, intercostal nerve. Runs between internal and innermost layers. Supplies muscle skin and parietal pleura.

Question 5

What’s the most important muscle of ventilation?

Answer 5

The diaphragm