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Iliohypogastric Nerve
Ilioinguinal nerve
Lateral Cutaneous Nerve of the Thigh
Femoral Nerve
Obturator Nerve
Lumbosacral Trunk
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- Formed in psoas muscle
- derived from upper 4 lumbar nerves
- anterior
rami
- receive grey rami communicantes from sympathetic trunk
- upper two give white rami communicantes to sympathetic trunk
- branches of plexus emerge from lateral, medial and anterior surfaces of
muscle
Branches of Plexus
- L1
- L2 and L3
- L1-L3
- L2-L4
- L4
| Joint |
Muscle Action |
Root supply |
Muscle action |
Root supply |
| Hip |
flexors |
L1,2,3 |
extensors |
L4,5,S1 |
| adductors |
abductors |
| medial rotators |
lateral rotators |
| Knee |
extensors |
L3,4 |
flexors |
L5,S1 |
| Ankle |
dorsi-flexors |
L4,5 |
plantar-flexors |
S1,2 |
| subtalar |
invertors |
L4,5 |
evertors |
L5,S1 |
| foot |
toe extensors |
L5,S1 |
toe long flexors |
S2 |
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small muscles of sole |
S3 |
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