Lumbosacral Plexus
From WikiMSK
The lumbosacral plexus can be divided into two anatomical parts: the upper lumbar plexus and the lower lumbosacral plexus.
Lumbar Plexus
The lumbar plexus is located within the psoas muscle. It contains the canterior rami of the T12 to L4 nerve roots.
| Nerve | Motor Supply | Sensory Supply | EMG |
|---|---|---|---|
| Iliohypogastric nerve (T12/L1) | Transverse and internal oblique muscles | Lower abdomen | N/A |
| Ilioinguinal nerve (L1) | - | Inguinal region, small area of media thigh, and upper scrotum/labia | N/A |
| Genitofemoral nerve (L1, L2) | Cremasteric muscle in men | Skin of femoral triangle. Lower scrotum/labia | N/A |
| Lateral femoral cutaneous nerve (L2,L3) | - | Lateral thigh | Can be tested, but unreliable. |
| Obturator nerve (L2, L3, L4 anterior rami) | Thigh adductors | Medial thigh | N/A |
| Femoral nerve (L2, L3, L4 anterior rami, posterior divisions) | Iliopsoas, sartorius, quadriceps | Medial lower leg (through saphenous nerve | Can be tested |
