26. Pelvic Vessels and Nerves

Question 1

Nerve roots of sacral plexus?

Answer 1

L4 - S4

Question 2

Nerve roots of sciatic nerve?

Answer 2

L4 - S3

Question 3

What does the sciatic nerve supply?

Answer 3

Posterior compartment of thigh

Branches supply ALL muscles of leg and foot

Question 4

Nerve roots of superior gluteal nerve?

Answer 4

L4, L5, S1

Question 5

What does the superior gluteal nerve supply?

Answer 5

Gluteus medius and minimus

Question 6

Nerve roots of inferior gluteal nerve?

Answer 6

L5, S1, S2

Question 7

What does the inferior gluteal nerve supply?

Answer 7

Gluteus maximus

Question 8

Nerve roots of nerve to obturator internus?

Answer 8

Direct from plexus L5, S1

Question 9

What does the nerve to obturator internus supply?

Answer 9

OI (obvs)

And superior gemellus

Question 10

Nerve roots of nerve to piriformis?

Answer 10

Direct from S1, S2

Question 11

What nerves supply levator ani?

Answer 11

Direct branches from S4

Pudendal nerve

Question 12

What nerves supply coccygeus?

Answer 12

Direct S4, S5

Question 13

Nerve roots of pudendal nerve?

Answer 13

S2, S3, S4

Question 14

Describe the course of the pudendal nerve?

Answer 14

Out via greater sciatic notch
Along ischial spine
In via lesser sciatic notch
Along ischioanal fossa and perineum

Question 15

What does the pudendal nerve supply? (5)

Answer 15

Motor and sensory

Levator ani
External anal sphincter
External urethral sphincter
Bulbospongiosus
Ischiocavernosus

Question 16

What ANS plexus is found at the bifurcation of the aorta?

Answer 16

Superior hypogastric plexus

Question 17

What type of fibres do lumbar splanchnic nerves carry?

Answer 17

Sympathetic

Question 18

What type of fibres do sacral splanchnic nerves carry?

Answer 18

Sympathetic

Question 19

What type of fibres do pelvic splanchnic (S2- S4) nerves carry?

Answer 19

Parasympathetic

Question 20

Describe the sympathetic and parasympathetic roles in erection and ejaculation

Answer 20

Point and shoot
Point (erection) - Parasympathetic
Shoot (ejaculation) - Sympathetic

Question 21

What nerves provide sensory supply to the anterior skin of pelvis?

Answer 21

Ilioinguinal
Genitofemoral
Pudendal

Question 22

What nerve provides sensory supply to the genitalia?

Answer 22

Pudendal

Question 23

At what vertebral level does the abdominal aorta bifurcate?

Answer 23

L4

Question 24

What are the divisions of the internal iliac artery?

Answer 24

Anterior

Posterior

Question 25

What are the branches of the anterior division of the internal iliac artery? (6)

Answer 25

Umbilical --> 2x superior vesical
Obturator
Inferior vesical (M)/ Uterine (F)  
Inferior gluteal 
Middle rectal
Internal pudendal

Question 26

At what vertebral level do the testicular/ ovarian arteries arise from the abdo aorta?

Answer 26

L2

Question 27

What are the branches of the posterior division of the internal iliac artery? (3)

Answer 27

Iliolumbar
Lateral sacral
Superior gluteal