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trunk muscles

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Muscle
Origin
Insertion
Action
rectus abdominis   pubic crest and symphysis   cartilage of 5 to 7 ribs and xyphoid process   flex vertebral column and compress abdomen  
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external oblique   inferior 8 ribs   iliac crest and linea alba   flex vertebral column and compress abdomen laterally flex and rotate vertebral column  
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internal oblique   iliac crest and inguinal ligament   cartilage of last 4 ribs and linea alba   flex vertebral column and compress abdomen laterally flex and rotate vertebral column  
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transversus abdominis   iliac crest and inguinal ligament   xyphoid process, linea alba and pubis   compress abdomen  
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inguinal ligament   anterior superior iliac spine   pubic tubercle   (blank)  
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external intercostals   inferior border of rib above   superior border of rib below   contraction increases rib cage dimentions  
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internal intercostals   superior border of rib below   inferior border of rib above   contraction decreases rib cage dimentions  
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diaphragm   xyphoid process of sternum and adjacent ribs   central tendon   contraction increases rib cage dimentions  
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serratus anterior   ribs   scapula   stabilize, abduct and rotate scapula  
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latissimus dorsi   ribs   intertubercular sulcus of humerus   extend, adduct and medially rotate arm at shoulder  
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Created by: hholly
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