Muscles of the Thorax:Breathing & Abdominal Wall
About this set
Created by:
SacredMidnight on March 20, 2011
Subjects:
Description:
O- Origin
I- Insertion
A- Action
NS- Nerve Supply
The first 3 muscles are those of the thorax and the latter 4 are of the abdominal wall.
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7 terms
Latin | English |
|---|---|
| External intercostals |  O- Inferior border of rib aboveI- Superior border of rib below A- Pulls ribs toward one another to elevate rib cage NS- Intercostal nerves |
| Internal intercostals | O-Superior border of rib below I- Inferior border (costal groove) of rib above A- Draw ribs together and depress rib cage NS- Intercostal Nerves |
| Diaphragm | O-inferior, internal surface of rib cage and sternum I- Central tendon A- Prime mover of inspiration (inhalation); flattens on contraction NS- Phrenic Nerves |
| Rectus Abdominis | O-Pubic crest and symphysis I-xiphoid process and costal cartilages of ribs 5-7 A- Flex and rotate lumbar region of vertebral column NS- Intercostal nerves (T6 or T7-T12) |
| External Oblique | O-by fleshy strips from outer surfaces of lower eight ribs I- most fibers insert into linea alba via a broad aponeurosis; some insert into pubic crest and tubercle and illiac crest A- Flex vertebral column and compress abdominal wall; aid muscles of back in trunk rotation and lateral flexation NS- Intercostal nerves(T7-T12) |
| Internal Oblique | O- lumbar fascia, illiac crest, and inguinal ligament I- linea alba, pubic crest, last three or four ribs, and costal margin A- As for external oblique NS- Intercostal Nerves(T7-T12) and L1 |
| Transverse abdominis | O-inguinal ligament, lumbar fascia, cartilages of last six ribs; illiac crest I- linea alba, pubic crest A- Compresses abdominal contents NS- Intercostal nerves (T7-T12) and L1 |
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