Matching Pairs Principle muscle of trunkOnline version Match by Kristie Borgheiinck 1 Sacrospinalis 2 Levator ani 3 Perineum 4 Diaphragm 5 External abdominal oblique 6 Internal and External Intercostals extends vertebral column to produce erect posture (long and thick below the trapezium and latissimus) aids defecation, support the pelvic viscera (posterior from tip of the coccyx to the anal canal) Compresses abdominal cavity, expel substances from body, and flex spinal column. floor of pelvis, provides support (horizontal lie near genitalia) elevate ribs and enlarge thoracic cavity attached to a fill the spaces between the ribs (lie at angles in opposite directions to each other) dome forms the partition between the thoracic cavity and abdominal cavity below (moves down with inhalation)
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