Matching Pairs Principle muscle of trunkOnline version Match by Kristie Borgheiinck 1 Internal and External Intercostals 2 Levator ani 3 External abdominal oblique 4 Sacrospinalis 5 Diaphragm 6 Perineum extends vertebral column to produce erect posture (long and thick below the trapezium and latissimus) Compresses abdominal cavity, expel substances from body, and flex spinal column. 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) aids defecation, support the pelvic viscera (posterior from tip of the coccyx to the anal canal) floor of pelvis, provides support (horizontal lie near genitalia)
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