Anatomy - MOINA of the Posterior Abdominal Wall

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Last updated 12:22 AM on 7/30/26
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8 Terms

1
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origin of psoas and iliacus

  • psoas: transverse processes, bodies, and intervertebral discs of T12 and 5 lumbar vertebrae

  • iliacus: iliac fossa

2
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insertion of psoas and iliacus

both into lesser trochanter of femur

3
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innervation of psoas and iliacus

  • psoas: lumbar plexus

  • iliacus: femoral nerve

4
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action of psoas and iliacus

  • both flex thigh on trunk

  • if thigh is fixed, both flex trunk on thigh, as in sitting up from lying position

5
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origin of quadratus lumborum

  • iliolumbar ligament

  • iliac crest

  • tips of transverse processes of lower lumbar vertebrae

6
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insertion of quadratus lumborum

12th rib

7
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innervation of quadratus lumborum

lumbar plexus

8
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action of quadratus lumborum

  • fixes 12th rib during inspiration

  • depresses 12th rib during forced expiration

  • laterally flexes vertebral column on the same side