Question
Root value of the nerve (marked with black arrow) shown in the picture is:
| A. |
S1 S2 S3
|
| B. |
S2 S3 S4
|
| C. |
S2 S3
|
| D. |
S3 S4
|
Show Answer
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Correct Answer � B
Explanation
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|
Answer B- S2 S3 S4
· Nerve shown here is pudendal nerve
· Pudendal nerve is formed by ventral divisions of ventral rami of S2, S3, S4
· It passes through greater sciatic foramen & then enters the pelvis through the lesser sciatic foramen
· Then it passes through the pudendal canal (Alcock’s canal )
· Branches are:
o External urethral sphincter
o Inferior rectal nerve
o Perineal nerve
o Dorsal nerve of penis or clitoris
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