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?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Q9. What causes detumescence following ejaculation?

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

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

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