Review Questions, Introduction to Thorax

Introduction to Thorax: Review Questions

1. The external intercostal muscles:

Are present in only the upper seven intercostal spaces

Are innervated by dorsal primary rami of spinal nerves T1 to T7

Anteriorly are replaced by a fibrous membrane between the costal cartilages

Anteriorly are deep to the transversus thoracis muscle

Superficially are covered only by serratus anterior muscle

2. Parietal pleura:

Covers the entire superior surface of the diaphragm

Is insensitive to pain

Is similar to parietal peritoneum at the microscopic level

Lines the oblique fissure of the left lung

Does not extend above the superior thoracic inlet

3. Transversalis fascia lines the:

Pleura cavity

Pericardial cavity

Superior surface of the diaphragm

Abdominopelvic cavity

Cupula

4. There are 12 ribs. Of these 12, seven are ______________, five are ____________ and two are _____________, which seems to add up to more than 12. However, the two ___________ ribs are also considered to be _______________ ribs.

False, true, floating, floating, false

False, true floating, false, floating

True, floating, false, floating, false

True, false, floating, false, floating

True, false, floating, floating, false

5. Intercostal muscles:

Are found only between the true ribs

Are innervated by dorsal primary rami

All have the same muscle fiber orientation

Are supplied by posterior intercostal arteries

Are not considered to be active during respiraion