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Muscles of the Trunk

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

external intercostals   origin: inferior border of each rib  
external intercostals   insertion: superior border of next rib  
external intercostals   action: elevate ribs  
internal intercostals   origin: superior border of each rib  
internal intercostals   insertion: inferior border of the preceding rib  
internal intercostals   action: depress ribs  
diaphragm   origin: xiphoid process, cartilages of ribs 4-10, and anterior surfaces of lumbar vertebrae  
diaphragm   insertion: central tendinous sheet  
diaphragm   action: contraction expands thoracic cavity, compresses abdominopelvic cavity  
external oblique   origin: lower eight ribs  
external oblique   insertion: linea alba and iliac crest  
external oblique   action: compresses abdomen, depresses ribs, flexes or laterally flexes vertebral column  
internal oblique   origin: illiac crest and adjacent connective tissues  
internal oblique   insertion: lower ribs, xiphoid of sternum and linea alba  
internal oblique   action: compresses abdomen, depresses ribs, flexes or laterally flexes vertebral column  
transversus abdominis   origin: cartilages of lower ribs, iliac crest, and adjacent connective tissues  
transversus abdominis   insertion: linea alba and pubis  
transversus abdominis   action: compresses abdomen  
rectus abdominis   origin: superior surface of pubis around symphysis  
rectus abdominis   insertion: inferior surfaces of costal cartilages (ribs 5-7) and xiphoid process  
rectus abdominis   action: depresses ribs, flexes vertebral column  


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Created by: lizzy.spangler