Lower Limb 5
LUMBOSACRAL PLEXUS
The lumbosacral plexus provides the motor and sensory innervation to the lower limb and is formed by ventral rami of the L2 through S3 spinal nerves.
• The major nerves of the plexus are the:
- |
Femoral nerve |
|
posteriordivisions of L2 through L4 |
- |
|
v |
|
|
t |
ant rior divisions of L2 through L4 |
Obturator |
|
- |
|
|
|
nerve |
|
|
|
Tibialner e |
an-erioredivisions of L4 through S3 |
|
Common |
fibular nerve-posterior divisions of L4 through S2 |
|
|
|
- |
|
|
|
- |
Superior gluteal nerve posterior divisions of L4 through S 1 |
Inferiorgluteal nerve -posterior divisions of LS through S2 |
|
|
|
|
|
|
|
- |
• The tibial nerve and common fibular nerve travel together through the gluteal region and thigh in a common connective tissue sheath and together are called the sciatic nerve.
• The common fibular nerve divides in the proximal leg into the superfi cial and deep fibularnerves.
Sciatic nerve
Figure 111-5-1 . Lumbosacral Plexus
