Advanced Epididymis Quiz

Q1. Which arterial source contributes importantly to the blood supply of the epididymis?

• Internal thoracic artery only
• Superior mesenteric artery only
• Middle cerebral artery
• Testicular artery and artery to the ductus deferens

Q2. How does the smooth muscle wall generally change from the head toward the tail of the epididymis?

• It becomes progressively thicker toward the tail
• It disappears completely in the tail
• It is replaced by cartilage
• It becomes skeletal muscle in the body

Q3. What is the functional significance of principal cell stereocilia?

• They beat rhythmically to propel sperm
• They produce testosterone
• They form a keratinized protective layer
• They increase surface area for absorption and secretion

Q4. Why are sperm entering the epididymis not yet fully functionally mature?

• They require epididymal maturation before gaining full functional competence
• They have not completed mitosis in the epididymis
• They must develop a nucleus in the epididymis
• They lack chromosomes until reaching the tail

Q5. Which lymph nodes primarily receive lymphatic drainage from the epididymis?

• Axillary nodes
• Submental nodes
• Lumbar or para aortic lymph nodes
• Superficial inguinal nodes only

Q6. Why does epididymal lymphatic drainage differ from the drainage of scrotal skin?

• Scrotal skin drains to lumbar nodes only
• Both always drain to the same superficial nodes
• The epididymis has no lymphatic drainage
• They have different developmental origins and lymphatic pathways

Q7. Which autonomic division is especially important for strong contractions of the epididymal duct during emission?

• Optic pathway
• Sympathetic nervous system
• Somatic sensory system only
• Parasympathetic system exclusively

Q8. What anatomical feature allows a long sperm transport pathway to fit within the compact epididymis?

• Division into separate ureters
• Formation of multiple bony canals
• Extensive coiling of the epididymal duct
• Compression inside the prostate

Q9. Why can obstruction of the epididymal duct impair fertility?

• It can block sperm maturation and passage into the ductus deferens
• It stops testosterone synthesis in the adrenal gland
• It blocks bile drainage
• It prevents urine formation by the kidneys

Q10. Which statement best integrates epididymal anatomy and function?

• A pelvic endocrine gland that produces urine
• A skeletal muscle surrounding the urethra
• A coiled duct connecting testicular outflow with the ductus deferens while supporting sperm maturation and storage
• A superficial lymph node of the groin