Advanced Penis Quiz

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This quiz contains 10 questions. Click below to begin.

Q1. Which type of endothelial cells regulate penile erection via nitric oxide release?

  • Arterial fibroblasts
  • Smooth muscle cells
  • Glomerular endothelial cells
  • Cavernosal endothelial cells

Q2. What is the function of the helicine arteries in the penis?

  • Transport lymph from corpus spongiosum
  • Transmit nerve impulses to glans
  • Drain venous blood from penis
  • Dilate and fill erectile tissue

Q3. Which neurotransmitter initiates vasodilation of penile arteries during arousal?

  • Nitric oxide (NO)
  • Serotonin
  • Dopamine
  • Norepinephrine

Q4. What is the role of phosphodiesterase type 5 (PDE5) in penile physiology?

  • Inhibits sympathetic output
  • Degrades cGMP to terminate erection
  • Stimulates nitric oxide production
  • Enhances testosterone secretion

Q5. Which plexus lies deep to Buck’s fascia and drains the erectile tissues?

  • Pampiniform plexus
  • Subcutaneous venous network
  • Superficial dorsal plexus
  • Deep dorsal venous plexus

Q6. What structural role does Buck’s fascia serve in the penis?

  • Lines the urethral lumen
  • Secretes pre-ejaculatory fluid
  • Supports and encloses erectile tissues
  • Connects penis to bladder

Q7. Which autonomic fibers are responsible for emission during ejaculation?

  • Parasympathetic fibers (S2–S4)
  • Sympathetic fibers (T12–L2)
  • Somatic motor fibers
  • Cranial nerves IX and X

Q8. Which corpus remains pliable during erection to maintain urethral patency?

  • Urethral meatus
  • Corpus spongiosum
  • Corpus cavernosum
  • Tunica albuginea

Q9. What causes detumescence following ejaculation?

  • Continued nitric oxide release
  • Persistent cavernosal dilation
  • Venous outflow blockage
  • Sympathetic vasoconstriction and cGMP breakdown

Q10. Which anatomical landmark divides the root and body of the penis?

  • Glans penis
  • Suspensory ligament
  • Deep dorsal vein
  • Corona of glans
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