This is the Abdominal Internal Oblique Muscle.
AKA Internal Oblique Muscles


  • the lumbar fascia (a connective tissue that covers the lower back)
  • the outer portion of the inguinal ligament (a ligament located on the bottom-outer edge of the pelvis)
  • back of the iliac crest


  • the bottom edge of the rib cage
  • the rectus sheath (fibrous tissue that covers the abdominal muscles)
  • the pubic crest (an area in the lower-front of the pelvis)


  • supports the abdominal wall
  • assists in forced respiration; aids in raising pressure in the abdominal area
  • ipsilateral rotation (same side)
  • lateral flexion of the torso (same side)

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