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Admon./Thor./Back

Muscle Actions

TermDefinition
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
Created by: ahasenmu
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