Thoracic Wall: Muscles Flashcards Preview

Gross II Exam II > Thoracic Wall: Muscles > Flashcards

Flashcards in Thoracic Wall: Muscles Deck (15):
1

What is the function of the thoracic cage?

1) protection of the upper abdominal organs
2) Site of muscle attachments
3) Resperation

2

What is resperation?

The change in air pressure to allow interthoracic volume to increase and thus the lungs to fill with air

3

What is the 2nd most important muscle of inspiration?

External Interncostal

(Diaphragm is the 1st)

4

What is the function of the external interncostal?

Elevates the ribs in insiration

5

What will replace the external intercostals when they reach the costochondral joint?

External intercostal membrane

6

What direction do the fibers of the external intercostal run?

Downward and Forward

7

The external intercostal takes its attachment point where?

Origin-lower boarder of ribs 1-11
Insertion- Upper boarders of ribs 2-12

8

What muscle will begin at the sternum and then continue as a membrane once they reach the and of the ribs?

Inner Intercostal Muscle

9

What is the function of the inner intercostal muscle?

Depress the ribs in forced experation

10

What is the fiber direction of the inner intercostal?

downward and backward

11

What other muscle of the thoracic cage will have fibers that run backward and downward?

Innermost intercostal

12

In general, what is the function of all of the intercostal muscles?

to prevent the pushing in or drawing out of the intercostal space during resperation

13

What muscles will depress the ribs during forces expiration?

1) Inner Intercostal
2) Innermost Intercostal
3) Subsoctalis
4) Transverus Thoracis

14

Which of the muscles of the thoracic wall will skip ribs to attach to another rib?

Subcostalis

15

The transervus thoracis takes its attachment points where?

O- posterior surface of the lower sternal body and xiphoid process
I- inner surface of costal cartilages 2-6