mm of thoracic wall Flashcards
1
Q
external intercostal m
A
- 11 pair
- most superficial
- fills from P. tubercles to A. costochondral joints
- fiber direction inferoanterior b/w one rib and the one inferior to it
- elevates in forced respiration
- maintains tonus in norm respiration
2
Q
external intercostal membrane
A
extends from costochondral joint to sternum
3
Q
internal intercostal m
A
- 11 pair
- fills from A. sternum to P.lateral costal angle
- fiber direction inferoposterior b/w rib and rib inferior to it
- depress ribs in forced expiration
- maintain tonus in norm respiration
4
Q
internal intercostal membrane
A
extends from costal angle to TP’s of vertebrae
5
Q
innermost intercostal m
A
- 11 pair
- fiber direction inferoposterior (only fill lateral intercostal space)
- depress ribs in forced respiration
- maintains tonus in norm respiration
6
Q
intercostal n.a.v.
A
separates internal intercostal mm and innermost intercostal mm
7
Q
subcostal m
A
- internal surface of lower ribs (near angle)
- fibers span 2+ or more intercostal spaces
- fiber direction inferoposterior
- weakly depress ribs
8
Q
transversus thoracic m
A
- inner surface of A. thoracic wall
- span superolaterally from inferior sternum to 2nd - 6th costal cartilages
- weakly depress ribs
- may function in proprioception
9
Q
thoracic wall mm with ll pairs
A
- external intercostal mm
- internal intercostal mm
- innermost intercostal mm
10
Q
thoracic wall mm that elevates
A
external intercostal mm
11
Q
thoracic wall mm that may function in proprioeption
A
transversus thoracic mm
12
Q
thoracic wall mm with inferoposterior fiber direction
A
- internal intercostal mm
- innermost intercostal mm
- subcostal mm
13
Q
weak rib depressor mm
A
- subcostal m
- transversus thoracic m
14
Q
thoracic wall mm that maintain tonus in norm respiration
A
- external intercostal mm
- internal intercostal mm
- innermost intercostal mm
