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Muscles - Trunk

Muscles of the Trunk

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
Created by: lizzy.spangler