This flashcard set features the muscles of the trunk. I hope you find it helpful as you study muscle identification and their actions in lab. All muscle model photographs by Rob Swatski (2009-2010). Visit my iTunes U site for Anatomy podcasts and PDF files of all of my anatomy photo visual guides! http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewPodcast?id=424629511

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

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