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Admon./Thor./Back
Muscle Actions
Term | Definition |
---|---|
diaphragm | contraction causes flattening of diaphragm (moving inferiorly) during inspiration and thus expands thoracic cavity. |
transversus abdominis | unilateral action: laterally flexes vertebral column. bilateral action: flexes vertebral column and compresses abdominal wall. |
rectus abdominis | flexes vertebral column and compresses abdominal wall |
external intercostalis | elevate ribs during quiet and forced inspiration |
internal intercostalis | depresses ribs during forced expiration |
external abdominal oblique | unilateral action: laterally flexes vertebral column; rotation of vertebral column. bilateral action: flexes vertebral column and compresses abdominal wall |
internal abdominal obliqueunilateral | unilateral action: laterally flexes vertebral column; rotation of vertebral column. bilateral action: flexes vertebral column and compresses abdominal wall. |
scalenes | flex the head, neck, and/or vertebral column |
erector spinae group (iliocostalis, logissimus, spinalis) | extend head, neck, and/or vertebral column |