QuestionSBA
QuestionChoice
This answer is incorrect. The pudendal nerve is formed from S2-S4 nerve roots, which are the roots involved in a pudendal nerve block.
10007435
e
S2-S3
QuestionChoice
This answer is incorrect. The spinal nerves S1-S4 form the sacral plexus. The pudendal nerve is formed from S2-S4 fibres only, which are those involved in a pudendal nerve block.
10007432
b
S1-S4
QuestionChoice
This answer is correct. A pudendal nerve block is a peripheral nerve block involving the S2-S4 nerve roots. It numbs the perineum and lower vagina and is performed before episiotomy.
10007431
a
S2-S4
QuestionChoice
This answer is incorrect. The nerve roots L4-S1 form the superior gluteal nerve which innervates the gluteus medius, maximus and tensor fascia lata. The nerve roots S2-S4 form the pudendal nerve, which are those involved in a pudendal nerve block.
10007433
c
L4-S1
QuestionChoice
This answer is incorrect. Nerve roots from L4-S3 form the sciatic nerve which supply the majority of the lower limb. The pudendal nerve is formed from S2-S4 nerve roots, which are those involved in a pudendal nerve block.
10007434
d
L4-S3
Concept
Chapter
2693
4595
Obstetric analgesia
Topic
174
Obstetrics
14033
A 28-year-old woman in labour requires an episiotomy to aid delivery of the foetal head. A pudendal nerve block is performed prior to making the incision.

Which of the following nerve roots are involved in a pudendal nerve block?
a