Anatomy

Question 1

Where does pudendal nerve arise from?

Answer 1

Dorsal nerve roots at S2, S3, and S4

Question 2

What innervates the striated external sphincter?

Answer 2

Pudendal nerve

Question 3

Where does the dorsal penile nerve arise from?

Answer 3

Pudendal nerve

Question 4

What nerve provides somatic sensation to the penis?

Answer 4

Dorsal penile nerve

Question 5

What nerves are responsible for ejaculation

Answer 5

Sympathetic chain arising from T10-L2

Question 6

What is the embryologic origin of the kidney

Answer 6

mesoderm

pronephros -> mesonephros -> metanephros

Question 7

What nerves control cerebral induced erections?

Answer 7

• In response to visual or sensory erotic stimulation to cerebral cortex
• Via central innervation of parasympathetic pathway through S2-S4 nerve routes
• Require intact spinal cord

Question 8

What are the three phases necessary for ejaculation?

Answer 8

1. Emission (sympathetic), results in swelling of bulbar urethra stimulating rhythmic contractions of bulbocavernosus and pelvic floor muscles under somatic control via S2-S4 nerve roots (Onuf’s nucleus) causing 2. closure of bladder neck (sympathetic) and 3. Expulsion

Question 9

What is emission?

Answer 9

Sympathetic induced contraction of prostatic smooth muscle, SVs and vas deferens allowing pre-ejaculatory fluid to be deposited into prostatic urethra

Question 10

What are the three branches of the penile artery

Answer 10

Bulbourethral, cavernosal artery, dorsal artery

Question 11

Where does the penile artery originate

Answer 11

internal pudendal artery

Question 12

Where does the superficial dorsal vein drain

Answer 12

Left saphenous vein (sometimes right saphenous)

Question 13

What are the branches of the SMA

Answer 13

middle colic  (transverse colon)
right colic (right colon)
ileocolic (distal ileum

Question 14

What are the branches of the IMA?

Answer 14

Left colic
sigmoid
superior hemrroidal
Marginal

Question 15

What is the marginal artery?

Answer 15

The arc that anastamoses the IMA and SMA

Branch of middle colic

Question 16

What causes foot drop?

Answer 16

Common peroneal nerve pressure

Question 17

What is the Triangle of Marcille? What traverses through there?

Answer 17

1. medial border of psoas, lateral margin of vertebral column, and iliolumbar ligament
2. Obturator nerve

Question 18

Name parts of the testicle distal to proximal

Answer 18

1. Semeniferous tubules
2. tubuli recti
3. rete testes
4. efferent ductules
5. Head of the epididymis

Question 19

What artery most reliably supplies omentum?

Answer 19

Right gastroepiploic (left does as well but right usually larger)

Question 20

Where to parathyroid hormone and Vit D induce calcium reabsorption?

Answer 20

Distal tubule

Calcium also absorbed in proximal convoluted tubule, but not under control of hormones

Question 21

Where are the nerves located that impact ejaculation during RPLND?

Answer 21

Sympathetic fibers posterior to IVC

Question 22

What nerve is responsible for psychogenic erections?

Answer 22

sympathetic

Question 23

Where are the neurons for the pudendal nerve?

Answer 23

Onuf’s nucleus

Question 24

What is the lymphatic drainage of distal urethra?

Answer 24

superficial and deep inguinal lymph nodes

Question 25

What is the lymphatic drainage of proximal urethra?

Answer 25

external -> internal -> obturator