Repro nerves

Question 1

What is the innervation of the Pelvic floor?

Answer 1

Perineal nerve (S2, 3 & 4)

Question 2

What is the innervation of the external urethral sphincter

Answer 2

Voluntary -> somatic
= Peudendal nerve - perineal branch (S2, 3 & 4)

Question 3

What nerve has voluntary/somatic control of faecal & urinary incontinence?

Answer 3

Pudendal nerve (S2, 3 & 4)

Question 4

What is the innervation of the external anal sphincter?

Answer 4

inferior rectal nerve; branch of the peudendal nerve (S2, 3 & 4)

Question 5

What nerve provides somatic supply to the skin at the root of the penis in the male and the labia in the female.

Answer 5

Ilioinguinal n (L1)
(lumbar plexus)

Question 6

What nerve supplies the mons pubis and labia majora in females, and the skin of the anterior scrotum in males

Also motor innervation to cremaster muscle

Answer 6

Genitofemoral n (L1-L2)
(Lumbar plexus)

Question 7

What nerve plexus provides autonomic nerve supply to the pelvis

Answer 7

Inferior hypogastric nerve plexus

Question 8

Describe the sympathetic nerve supply to the internal pelvic organs

Answer 8

The sympathetic fibres originate from L1 and L2 via the hypogastric nerve and terminal aspect of the sympathetic trunk.

In a male they supply the vas deferens, seminal vesicles, prostate and epididymis.
In a female they supply the ovaries, uterus, fallopian tubes and vagina.

Question 9

Sympathetic nerve supply to the vas deferens, seminal vesicles, prostate and epididymis.

Answer 9

L1 and L2 via the hypogastric nerve

Question 10

Sympathetic nerve supply to the ovaries, uterus, fallopian tubes and vagina

Answer 10

L1 and L2 via the hypogastric nerve

Question 11

Where do the parasympathetic fibres in the pelvic originate from

Answer 11

Pelvic splanchnic nerves (S2 - S4)

Question 12

Parasympathetic innervation of erectile tissue in males and females

Answer 12

Pelvic splanchnic nerves (S2 to S4).

Question 13

What is the hypogastric plexus composed of

Answer 13

The hypogastric and pelvic splanchnic nerves merge to form the inferior hypogastric plexuses, which therefore consist of both sympathetic and parasympathetic fibers

Hypogastric nerve = sympathetic supply to pelvis viscera

Pelvic splanchnic nerve= parasympathetic supply to the pelvic viscera

Question 14

What ligament contains the ovarian nerve and vessels?

Answer 14

The suspensory ligament of the ovary

Question 15

What nerve controls micturition, dilation of erectile tissue in both sexes and defecation.

Answer 15

Parasympathetic component of the pelvic plexus

(pelvic splanchnic nerve)

Question 16

Is the internal/vesical urethral sphincter voluntary or involuntary

Answer 16

Involuntary

Internal = Involuntary

Question 17

What is the sympathetic nerve supply of the internal/vesical urethral sphincter?

Answer 17

lower thoracic and upper lumbar (T11 - L2) segments of the spinal cord. These nerves maintain tonic contraction of the internal urethral sphincter, thereby preventing urine outflow from the bladder into the urethra

Sympathetic: T11-L2

Question 18

What spinal level do we find the spinal micturition center, providing parasympathetic innervation to the internal urethral sphincter

Answer 18

Sacral levels S2-S4: spinal micturition centre

Question 19

What is the parasympathetic nerve supply of the internal/vesical urethral sphincter

Answer 19

Sacral levels S2 - S4 (spinal micturition center). It acts to “inhibit” the internal sphincter muscle, thereby relaxing it and allowing urine to pass from the bladder into the urethra.

Parasympathetic makes you Pee
- P and P

Parasympathetic: S2-S4

Question 20

Is the external urethral sphincter voluntary or involuntary

Answer 20

voluntary control

Question 21

What is the innervation of the external urethral sphincter

Answer 21

Perineal branches of the pudendal nerve (S2-4)

Question 22

What nerve & artery supplies the vulva

The contents of the vulva are:

1. Mons pubis 2. Labia majora 3. Labia minora
2. Vestibule 5. Bartholin’s glands 6. Clitoris

Answer 22

pudendal nerve, and internal pudendal artery

Question 23

What is the nerve supply of the penis?

Answer 23

Ilioinguinal nerve (L1): somatic supply to skin at root of penis
Dorsal n of the penis: sensory supply to the penis

Genitogemoral nerve (L1-2): Sensory to skin of anterior scrotum

Question 24

Nerve supply to pelvic floor and external urethral sphincter

Answer 24

peudendal nerve

Question 25

What nerve supplies somatic supply to the labia?

Answer 25

Ilioinguinal nerve (L1)- same as somatic sensation to skin at root of penis

Question 26

Nerve supply to mons pubis

Answer 26

Genital branch of genitofemoral nerve

Question 27

Nerve supply to labia major

Answer 27

Genital branch of genitofemoral nerve
and ilioinguinal n

Question 28

Motor innervation of cremasteric muscle

Answer 28

Genital branch of genitofemoral nerve

Question 29

Label the missing nerves

Answer 29

It arises from the ventral rami (anterior divisions) of the spinal nerves S2, S3 and S4.
After its formation, the pudendal nerve descends and passes between the piriformis andischiococcygeus muscles. It leaves the pelvis through the lower part of thegreater sciatic foramen. It then crosses thesacrospinous ligament (close to its insertion to the ischial spine),and then re-enters the pelvis through thelesser sciatic foramen.

Question 30

Label the missing nerves

Answer 30

Question 31

Label this nerve and state its innervation

Answer 31

Ilioinguinal nerve
Motor: Internal oblique muscle, transversus abdominis muscle
Sensory: Skin of proximal medial thigh, mons pubis, labium majus and root of the clitoris; anterior scrotum and root of the penis

Question 32

Label the missing nerves

Answer 32

Question 33

Label the missing nerves

Answer 33