Muscles of Lumbar Spine: Their Actions and Nerve Root Derivations
Action
|
Muscle
Acting
|
Nerve
Root Derivation
|
Forward flexion
|
1. Psoas major
|
L1-L3
|
2. Rectus abdominis
|
T6-T12
|
|
3. External abdominal oblique
|
T7-T12
|
|
4. Internal abdominal oblique
|
T7-T12,L1
|
|
5. Transversus abdominis
|
T7-T12,L1
|
|
6. Intertransversarii
|
L1-L5
|
|
Extension
|
1. Latissimus dorsi
|
Thoracodorsal (C6-C8)
|
2. Erector spinae
Iliocostalis lumborum
Longissimus thoracic
|
L1-L3
|
|
L1-L3
|
||
L1-L5
|
||
3. Transversospinalis
|
L1-L5
|
|
4. Interspinales
|
L1-L5
|
|
5. Quadratus lumborum
|
T12,L1-L4
|
|
6. Multifidus
|
L1-L5
|
|
7. Rotatores
|
L1-L5
|
|
8. Gluteus maximus
|
L1-L5
|
|
Side Flexion
|
1. Latissimus dorsi
|
Thoracodorasal (C6-C8)
|
2. Erector spinae
Iliocostalis lumborum
Longissimus thoracic
|
L1-L3
|
|
L1-L3
|
||
L1-L5
|
||
3. Transversalis
|
L1-L5
|
|
4. Intertransversarii
|
L1-L5
|
|
5. Quadratus lumborum
|
T12, L1-L4
|
|
6. Psoas major
|
L1-L3
|
|
7. External abdominal oblique
|
T7-T12
|
|
Rotation
|
1. Transversalis
|
L1-L5
|
2. Rotatores
|
L1-L5
|
|
3. Multifidus
|
L1-L5
|
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