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4 Cards in this Set
- Front
- Back
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External Oblique
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Bilaterally: flexes vertebral column; tilts pelvis posteriorly; supports and compresses the abdominal viscera; depresses thorax
Unilaterally: depresses ribs; laterally flexes the vertebral column approximating the thorax and iliac crest; along with lateral fibers of internal oblique of same side, rotates the vertebral column (with internal oblique on opposite side); when pelvis is fixed, right external oblique rotates thorax counterclockwise, left rotates the thorax clockwise Origin lower eight ribs Insertion linea alba and anterior part of iliac crest |
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Internal Oblique
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Bilaterally: flexes vertebral column; depresses thorax; compresses and supports the lower abdominal viscera in conjunction with transversus abdominis
Unilaterally: rotates thorax backward (in conjunction with the anterior fibers of the external oblique on the opposite side); right internal oblique rotates thorax clockwise, left rotates thorax counterclockwise on fixed pelvis; lateral fibers (along with lateral fibers of external oblique on same side) laterally flexes the vertebral column approximating the thorax and pelvis Origin thoracolumbar fascia iliac crest lateral half of inguinal ligament Insertion cartilage of lower three to four ribs xiphoid process linea alba |
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Transversus Abdominis
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compresses abdomen
Origin cartilage of lower six ribs thoracolumbar fascia lateral part of inguinal ligament Insertion linea alba and pubis iliac crest |
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Rectus Abdominis
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flexes vertebral column by approximating the thorax and pelvis
with pelvis fixed, moves thorax toward pelvis with thorax fixed, moved pelvis toward thorax depresses ribs |
