S3 NERVE

  

ORIGIN: Spinal cord segment S3. 

COURSE/DISTRIBUTION: This nerve takes origin from spinal cord segment S1 and leaves the vertebral canal by passing through the dorsal sacral foramen between S3 and S4 vertebrae. It immediately divides into two rami- dorsal and ventral rami. 

Dorsal ramus:

It immediately turns backwards, under the cover of the multifidus and divided into medial and lateral branches.

bulletThe medial branch immediately passes to the multifidus where it ends.
bulletThe lateral branch runs laterally and join others to form loops on the posterior aspect of the sacrum. From these loops, cutaneous nerves emerge which pierce the gluteus maximus and supply the skin over the gluteal area.

Ventral ramus:

The ventral ramus of S3 takes part in the formation of the sacral plexus. It has 4 branches. Its terminal part joins the tibial part of the sciatic nerve.

BRANCHES.

bulletBranch 1 – visceral branch
bulletBranch 2 –to join pudendal nerve
bulletBranch 3 to join perforating cutanaeous nerve
bulletBranch 4 to join the posterior cutaneous nerve of thigh.
bulletTerminal branch to join the common peroneal part of sciatic nerve.

ROOT VALUE: S3.

   

 

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Creator: Oluwole Ogunranti


 

 

 

 

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