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Muscles of abdominal wall

Muscles of abdominal wall - o action compresses abdomen...

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Muscles of abdominal wall - rectus abdominis o origin: pubic crest & pubic symphysis o insertion: cartilage of ribs 5-7 & xiphoid process o action: flexes vertebral column & compresses abdomen - external oblique o origin: lower 8 ribs o insertion: iliac crest & linea alba o action: compresses abdomen & flexes vertebral column - internal oblique o origin: iliac crest, inguinal ligament & thoracolumbar fascia o insertion: cartilage of last 3 or 4 ribs; linea alba o action: compresses abdomen & flexes vertebral column - transverse abdominis o origin: iliac crest, inguinal ligament, lumbar fascia & cartilage of lower 6 ribs o insertion: xiphoid process, linea alba & pubis
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Unformatted text preview: o action: compresses abdomen Muscles used in breathing- diaphragm o origin: xiphoid process of sternum, costal cartilage of lower 6 ribs & lumbar vertebrae o insertion: central tendon o action: increases height & volume of thoracic cavity, resulting in inhalation- external intercostals o origin: superior rib o insertion: inferior rib o action: elevates ribs & increases width & depth of thoracic cavity, resulting in inhalation- internal intercostals o origin: superior rib o insertion: inferior rib o action: further decreases width & depth of thoracic cavity during forced exhalation page3...
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