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abdominal wall 11.7
muscles that act on the abdominal wall
muscle | origin | insertion | action | intervation |
---|---|---|---|---|
rectus abdominus | pubic crest and pubic symphsis | cartilage of 5th to 7th ribs and xiphoid process | flexes vertebral column, sepecially lumbar portion and compresses abdomen to aid in defecation urination forced exhalation and childbirth | thoracic spinal nerve t7 - t12 |
external oblique | inferior 8 ribs | lliac crest and linea alba | togather compresses abdomen and flex vetebral column acting singly..laterally flexes vertebral column especially lumbar portion and rotate vertebral column | thoracic spinal nerves t7 - t12 and the iliohypogastric nerve |
internal oblique | iliac crest and inguinal ligament and thoracolumbar fascia | cartilage of last 3-4 ribs and linea alba | togather compress abdomen and flex vertebral column singly laterally flexes vertebral column especially lumbar and rotates vertbral column | thoracis spinal nerves t8 - t12 , iliohypogastric nerve and ilioinguinal nerve |
transversus abdominis | iliac crest inguinal ligament, lumbar fascia and cartilages of inferior 6 ribs | xiphois process, linea alba, and pubis | compresses abdomen | thoracic spinal nerves t8- t12 iliphypogastric nerve and ilioguinal nerve |
quadratus lumborum | iliac crest and iliolumbar ligament | inferior border of 12th rib and first 4 lumbar vertebrae | togather... pull 12th ribs inferiorly during forced exhalation, fix 12th ribs to prevent their elevation during deep inhalation, and help extend lumbar portion of vertebral column , singly laterally flex vetebral column especially lumbar portion | thoracic spinal nerve t12 and lumbar spinal nerve L1 - L3 or L1 - L4 |