Sacral Plexus

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Lumbosacral trunk

The plexus is located in the psoas muscle. The important branches are the femoral and obturator nerves.

The femoral nerve (L2L3L4) emerges from the lateral border of the psoas muscle and leaves the abdomen laterally below the inguinal ligament with the femoral artery.

The obturator nerve (L2L3L4)

ZD L4

Common peroneal nerve

ZD L4

Common peroneal nerve

Tibial nerve

To pudendal plexus

Tibial nerve

Greater sciatic foramen

The plexus is located on the posterior wall of the pelvis. The five roots of the plexus divide into anterior and posterior divisions. The L4L^S,S2 divisions form the common peroneal nerve. The L4L5S1S2S3 anterior divisions form the tibial nerve. Both these nerves fuse to form the sciatic nerve.

Sciatic nerve L4L5S1S2S3

Sciatic nerve

To pudendal plexus

The posterior divisions S2S3 pass to the pudendal plexus.

The common peroneal and tibial nerves (sciatic nerve) leave the pelvis by the greater sciatic foramen. In the popliteal fossa the sciatic nerve splits into its constituent nerves.

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