16 terms

Muscles of the Trunk

Rob Swatski, Associate Professor of Biology at HACC York Campus (HACC, Central Pennsylvania's Community College) http://robswatski.virb.com/
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External oblique
Compresses abdomen; laterally flexes and rotates vertebral column
Internal intercostals
Draws the ribs together and depresses rib cage
Internal oblique
Compresses abdomen; laterally flexes and rotates vertebral column
Rectus abdominis
Compresses abdominal cavity and flexes vertebral column
Transversus abdominis
Constricts abdomen and supports abdominal viscera
External intercostals
Elevates the rib cage
Pectoralis minor
Elevates 3rd-5th ribs during forced inspiration
Diaphragm
Flattens on contraction increasing the volume of thorax during inspiration
Transversus abdominis
Constricts abdomen and supports abdominal viscera
Quadratus lumborum
Flexes lumbar region of vertebral column laterally to the same side; stabilizes and extends the lumbar vertebrae
Levator ani
Forms the floor of pelvic cavity; assists in defecation
Spinalis group of erector spinae
Extends vertebral column
Longissimus group of erector spinae
Extends and laterally flexes vertebral column
Iliocostalis group of erector spinae
Extends and laterally flexes vertebral column
External oblique
Compresses abdomen; laterally flexes and rotates vertebral column
Quadratus lumborum
Flexes lumbar region of vertebral column laterally to the same side; stabilizes and extends the lumbar vertebrae