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Origins, Insertions & Actions of the Muscles of the Vertebral Column

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dellg85's version from 2016-02-18 10:48

Origins Insertions And Actions of Muscles of the Arm

 

MuscleOriginInsertionAction
Iliocostalis (Erector Spinae group)Ribs and iliac crestTransverse processes of the cervical, thoracic and lumbar vertebrae and ribs superior to the originExtends the spine
Longissimus (Erector Spinae Group)Transverse processes of the cervical, thoracic and lumbar vertebraeTransverse processes of the superior vertebrae to the originExtends the head and rotates it to the same side, extends the spine
Spinalis (Erector Spinae Group)Spinous processes of the cervical, thoracic and lumbar vertebraeSpinous processes of the superior vertebrae to the originExtends the spine
Quadrus LumbarumIliac crest and iliolumbar fasciaUpper 4 lumbar vertebrae and lower margin of 12th ribUnilateral concentric contraction - flexion of the lumbar spine
Unilateral isometric contraction - prevents lateral flexion of the spine (ie when carrying a heavy bag or suitcase in one hand)
Bilateral eccentric contraction - assists in preventing hyperextension of the lumbar spine
MultifidusSacrum and transverse processes of the vertebraeSpinous processes 2-4 vertebrae superior to the originExtends the vertebral column. Rotates the vertebral column. Important to lumbar spine stability because it is a "local" muscle, controlling the fine positioning of the adjacent vertebrae
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