Pelvic Nerves and Vessels

Question 1

What is the sacral plexus

Answer 1

A network of nerve fibres that supplies the skin and muscles of the pelvis and lower limb

Question 2

Where is the sacral plexus located

Answer 2

The surface of the posterior pelvic wall, anterior to the piriformis muscle

Question 3

What forms the plexus

Answer 3

The anterior rami of S1-4, it also has contribution form L4 and L5

Question 4

What are the main branches of the sacral plexus

Answer 4

Superior gluteal, inferior gluteal, sciatic, posterior femoral cutaneous and pudendal

Question 5

Nerve root of the superior gluteal

Answer 5

L4-S1

Question 6

Superior gluteal nerve innervation

Answer 6

The gluteus minimus and medius

Question 7

Nerve root of the inferior gluteal

Answer 7

L5-S2

Question 8

Innervation of inferior gluteal

Answer 8

Gluteus maximus

Question 9

Nerve roots of tibial portion of the sciatic nerve

Answer 9

L4-S3

Question 10

innervation of the tibial portiotn of the sciatic nerve

Answer 10

Muscles of the posterior thigh and hamstring potion of adductor magnus

Question 11

Indirect innervation of tibial portion of sciatic nerve

Answer 11

Muscles of the leg and foot

Question 12

nerve roots of the fibular portion of the sciatic nerve

Answer 12

L4-S3

Question 13

innervation of the fibular portion of the sciatic nerve

Answer 13

short head of biceps femoris, all muscles in anterior and lateral compartment of thigh and extensor digitorum brevis

Question 14

What do the terminal branches of the fibular portion of the sciatic nerve innervate

Answer 14

Sensory information to the skin of the lateral leg. heel and both dorsal and plantar surfaces of the foot

Question 15

nerve roots of the posterior femoral cutaneous nerve

Answer 15

S1-S3

Question 16

Innervation of posterior femoral cutaneous nerve

Answer 16

Skin on the posterior surface of the thigh and leg and also the skin of the perineum

Question 17

where do most nerves leave the pelvis through

Answer 17

The greater sciatic foramen

Question 18

Smaller branches coming form the sacral plexus and their nerve roots

Answer 18

nerve to piriformis (S1,S2)
nerve to obturator internus (L5, S1)
nerve to quadratus femoris
levator ani (S4, pudendal)
coccygeous (S4,S5)

Question 19

Nerve roots of the pudendal nerve

Answer 19

S2-S4

Question 20

Whta does the pudendal nerve innervate

Answer 20

The skeletal muscle in the perineum, the external urethral sphincter, the external anal sphincter, elevator ani, penis/clitoris and most of the skin of the perineum

Question 21

What does the pudendal nerve travel through to leave the pelvis

Answer 21

The greater sciatic notch

Question 22

What does nerve to obutrator internus innervate

Answer 22

Obturator internus and superior gemellus

Question 23

Where is the superior hypogastric plexus

Answer 23

At the bifurcation of the abdominal aorta

Question 24

functions of sympathetic innervation

Answer 24

Decreases moement ewithin the rectum, contracts internal anal and urethral sphincters and relaxes the detrusor muscle

Question 25

What does the sympathetic nervous system cause during ejaculation

Answer 25

The contraction of the vas deferens and seminal vesicles

Question 26

How is the uterus contracted/relaxed

Answer 26

through sympathetic innervation and hormonal control

Question 27

what effect does the sympathetic system have on arteries

Answer 27

it causes vasoconstriction

Question 28

What provides parasympathetic innervation

Answer 28

Pelvic splanchnic nerves (S2-S4)

Question 29

functions of parasympathetic innervation

Answer 29

Increases motility of the rectum and anal canal, relaxes the internal anal sphincter, and contracts the detrusor muscle and inhibits contraction of internal sphincter

Question 30

What effect does the parasympathetic innervation have on arteries

Answer 30

Vasodilation of arteries

Question 31

Which branch of the ANS causes erection

Answer 31

parasympathetic

Question 32

Where does the aorta divide

Answer 32

L4

Question 33

What does the bifurcation of the aorta give

Answer 33

common iliac arteries

Question 34

what does the common iliacs split into

Answer 34

the internal and external iliac branches

Question 35

What supplies blood to the pelvis

Answer 35

internal iliac

Question 36

divisions of the internal iliac

Answer 36

Anterior and posterior division

Question 37

branches of the anterior division of the internal iliac

Answer 37

Umbilical, obturator, inferior vesical, middle rectal, inferior gluteal and inferior pudendal

Question 38

what do the inferior vesical and middle rectal arteries supply in males

Answer 38

Prostate, seminal vesicles and ductus deferens

Question 39

where do the testicular arteries come from

Answer 39

L2 of the abdominal aorta

Question 40

What is the equivalent of the inferior vesical artery in females

Answer 40

uterine artery

Question 41

what does the uterine artery supply

Answer 41

uterus, ovaries and part of the bladder

Question 42

what artery is present in females but not in males

Answer 42

Vaginal artery

Question 43

What are the posterior division of the internal iliac

Answer 43

iliolumbar, lateral sacral and superior gluteal