Pelvic Viscera — MCQs
Which of the following is not felt with a digital rectal examination?
Which of the following is least important in the maintenance of normal fecal continence?
Which structure is related to the lateral wall of the vagina and uterus?
Order the following structures of the fallopian tube from lateral to medial:
Causes of retention of urine in reproductive age group: a) Cervical fibroid b) Retroverted gravid uterus c) Unilateral hydronephrosis d) Severe UTI e) Posterior urethral valve
Trigone of urinary bladder develops from:
Which artery supplies the ductus deferens?
Anal valve is found in which part of anal canal?
Which zone of the prostate is primarily involved in Benign Prostatic Hyperplasia (BPH)?
All are true regarding course of ureter in pelvis except
Pelvic Viscera Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is not felt with a digital rectal examination?
- A. Seminal vesicles
- B. Prostate
- C. Rectovesical pouch
- D. Ureter (Correct Answer)
Explanation: ***Ureter*** - The **ureters** are too deep and medially located to be reliably palpated during a **digital rectal examination** (DRE). - They are typically not accessible through the rectal wall due to their anatomical position posterior to the urinary bladder and prostate (in males). *Seminal vesicles* - The **seminal vesicles** are located superior to the prostate and can sometimes be palpated, especially if enlarged or inflamed. - They are adjacent to the posterior surface of the bladder and anterior to the rectum. *Prostate* - The **prostate gland** is directly anterior to the rectum and is the primary structure evaluated during a **DRE**. - Its size, consistency, and any nodules or tenderness can be assessed. *Rectovesical pouch* - The **rectovesical pouch** is the peritoneal reflection between the rectum and the bladder in males. - While not a distinct organ to "feel," pathology within this space (e.g., fluid collections, masses) can sometimes be appreciated as a fullness or mass effect above the prostate via the DRE.
Question 2: Which of the following is least important in the maintenance of normal fecal continence?
- A. Anorectal angulation
- B. Rectal innervation
- C. Internal sphincter
- D. Haustral valve (Correct Answer)
Explanation: **Haustral valve** - The **haustral valve** (or redundant mucosal folds within the haustra) primarily functions to *increase surface area* for water absorption and slow the passage of contents through the colon. - While critical for digestive function, it plays a *negligible direct role* in the mechanisms preventing involuntary stool leakage. *Anorectal angulation* - The **anorectal angle**, formed by the pull of the **puborectalis muscle**, creates a sharp bend that acts as a flap valve, significantly contributing to continence. - Loss of this angle (e.g., due to injury or structural changes) substantially impairs continence. *Rectal innervation* - **Intact innervation** of the rectum provides crucial sensory feedback regarding rectal distension and stool consistency, allowing for conscious control of defecation. - It also mediates the **rectoanal inhibitory reflex** and the ability to voluntarily contract external anal sphincters, both vital for continence. *Internal sphincter* - The **internal anal sphincter** is an *involuntary smooth muscle* responsible for approximately 70-80% of the resting anal tone, providing continuous passive continence. - Damage to this sphincter leads to substantial impairment in continence, particularly against flatus and liquid stool.
Question 3: Which structure is related to the lateral wall of the vagina and uterus?
- A. Inferior vesical artery
- B. Ureter (Correct Answer)
- C. Middle rectal artery
- D. Urethra
Explanation: ***Ureter*** - The **ureter** passes lateral to the cervix [1] and upper part of the vagina, making it closely related to the lateral walls of both structures [1]. - It runs approximately **2 cm lateral to the supravaginal cervix** as it courses toward the bladder [1][2]. - It is commonly encountered during gynecological procedures, especially **hysterectomy**, due to its proximity to the uterine artery and cervix (the classic "water under the bridge" relationship) [1]. *Inferior vesical artery* - The **inferior vesical artery** (or vaginal artery in females) primarily supplies the bladder and vagina. - While vaginal branches do supply the lateral vaginal walls, the artery itself is not as consistently related to the lateral wall of the **uterus** as the ureter. - The ureter is a more constant and clinically significant lateral relation to both structures. *Middle rectal artery* - The **middle rectal artery** primarily supplies the middle part of the rectum. - It is not directly related to the lateral walls of the vagina and uterus but rather lies posterior to these structures. *Urethra* - The **urethra** is located anterior to the vagina and inferior to the bladder, primarily draining urine. - It does not run along the lateral walls of the vagina or uterus [1].
Question 4: Order the following structures of the fallopian tube from lateral to medial:
- A. Isthmus-Infundibulum-Ampulla-Interstitial
- B. Infundibulum-Ampulla-Isthmus-Interstitial (Correct Answer)
- C. Ampulla-Isthmus-Infundibulum-Interstitial
- D. Ampulla-Infundibulum-Isthmus-Interstitial
Explanation: ***Infundibulum-Ampulla-Isthmus-Interstitial*** - This order correctly represents the anatomical progression of the fallopian tube from the **distal, fimbriated end** (infundibulum) closest to the ovary, moving **medially** towards the uterus [2]. - The **infundibulum** captures the oocyte, the **ampulla** is often where fertilization occurs, the **isthmus** is narrow, and the **interstitial** (or intramural) segment passes through the uterine wall [1]. *Isthmus-Infundibulum-Ampulla-Interstitial* - This order is incorrect as it places the **isthmus** as the most lateral structure, which is anatomically wrong. - The **infundibulum** and **ampulla** are more lateral than the isthmus [2]. *Ampulla-Isthmus-Infundibulum-Interstitial* - This sequence is incorrect because the **ampulla** is not the most lateral part; the **infundibulum** with its fimbriae is. - It also incorrectly places the **isthmus** before the infundibulum. *Ampulla-Infundibulum-Isthmus-Interstitial* - This order is incorrect because the **infundibulum** is always lateral to the **ampulla** [1]. - The infundibulum is the funnel-shaped end that opens into the peritoneal cavity and contains the fimbriae.
Question 5: Causes of retention of urine in reproductive age group: a) Cervical fibroid b) Retroverted gravid uterus c) Unilateral hydronephrosis d) Severe UTI e) Posterior urethral valve
- A. ACD
- B. BCD
- C. ABC
- D. ABD (Correct Answer)
Explanation: ***Correct: ABD*** - **Cervical fibroid** and **retroverted gravid uterus** can cause extrinsic compression of the urethra or bladder neck, leading to **urinary retention** in women of reproductive age. - **Severe UTI** can cause bladder inflammation and dysfunction, manifesting as acute urinary retention. *Incorrect: ACD* - This option incorrectly includes **unilateral hydronephrosis** as a direct cause of urinary retention. - Unilateral hydronephrosis is typically due to an obstruction higher up in one ureter and does not directly obstruct bladder emptying, though bilateral hydronephrosis *could* occur with lower urinary tract obstruction. *Incorrect: BCD* - This option correctly identifies **retroverted gravid uterus** and **severe UTI** as causes but incorrectly includes **unilateral hydronephrosis**. - It also omits **cervical fibroid**, which is a significant cause of retention in this demographic. *Incorrect: ABC* - This option incorrectly includes **unilateral hydronephrosis**. - Unilateral hydronephrosis affects the upper urinary tract (kidney/ureter) and does not cause bladder outlet obstruction or urinary retention. **Key Points:** - **Cervical fibroid**: Causes mechanical urethral/bladder neck compression - **Retroverted gravid uterus**: Classic cause in 2nd trimester (12-16 weeks) when incarcerated uterus compresses urethra - **Severe UTI**: Causes retention via bladder inflammation, edema, and detrusor dysfunction - **Unilateral hydronephrosis**: Upper urinary tract issue, NOT a cause of urinary retention - **Posterior urethral valve**: Congenital male condition, irrelevant to reproductive age women
Question 6: Trigone of urinary bladder develops from:
- A. Ectoderm
- B. Mesoderm (Correct Answer)
- C. None of the options
- D. Endoderm of urachus
Explanation: ***Mesoderm*** - The **trigone** of the urinary bladder develops from the **distal ends of the mesonephric (Wolffian) ducts**, which are **mesodermal in origin**. - These ducts are **absorbed into the posterior wall of the bladder**, forming the smooth triangular area between the two ureteric orifices and the internal urethral orifice [1]. - Although the epithelium of the trigone is later **replaced by endodermal epithelium** from the urogenital sinus, the **structural origin remains mesodermal**. - This is a classic example of **epithelial metaplasia** where endodermal epithelium replaces mesodermal tissue. *Endoderm of urachus* - The **urachus** is the fibrous remnant of the allantois that connects the apex of the bladder to the umbilicus. - It forms the **median umbilical ligament** in adults and does **not contribute to the trigone**. - The **urogenital sinus** (endodermal) forms the majority of the bladder body, but not the trigone. *Ectoderm* - The **ectoderm** forms the nervous system, epidermis, and sensory epithelia. - It does **not contribute** to the development of the urinary bladder or its trigone. - The urinary system is derived from **mesoderm** (kidneys, ureters, trigone) and **endoderm** (bladder body, urethra). *None of the options* - This is incorrect because **mesoderm** is the correct embryological origin of the trigone. - The mesonephric ducts that form the trigone are definitively mesodermal structures.
Question 7: Which artery supplies the ductus deferens?
- A. Deferential artery (Correct Answer)
- B. Cremasteric artery
- C. Inferior epigastric artery
- D. Vesical artery
Explanation: ***Deferential artery*** - The **deferential artery** is the primary blood supply to the **ductus deferens**. It typically originates from the **superior or inferior vesical artery**. - This artery runs alongside the ductus deferens within the **spermatic cord**, providing arterial branches throughout its length. *Cremasteric artery* - The **cremasteric artery** primarily supplies the **cremaster muscle** and the fascial coverings of the spermatic cord [1]. - While it traverses the spermatic cord, it does not directly supply the ductus deferens itself. *Inferior epigastric artery* - The **inferior epigastric artery** supplies the **anterior abdominal wall muscles** and skin [1]. - It does not directly supply the ductus deferens but gives rise to the **cremasteric artery** as one of its branches [1]. *Vesical artery* - The **vesical arteries** (superior and inferior) primarily supply the **urinary bladder**. - While the deferential artery often originates from a vesical artery, "vesical artery" itself is not the direct and specific supply to the ductus deferens.
Question 8: Anal valve is found in which part of anal canal?
- A. Lower
- B. At anus
- C. Middle (Correct Answer)
- D. Upper
Explanation: ***Middle*** - The **anal valves** are crescentic folds located at the level of the **pectinate (dentate) line** in the middle portion of the anal canal. - They mark the inferior limit of the **anal columns** and form small recesses called **anal sinuses**. *Lower* - The lower part of the anal canal, below the pectinate line, is lined by **anoderm** and lacks anal valves. - This region is sensitive to pain due to somatic innervation. *At anus* - The anus refers to the external opening and perianal skin, which does not contain anal valves. - The anal canal transitions into the perianal skin at the anocutaneous line. *Upper* - The upper part of the anal canal, above the pectinate line, contains the **anal columns (columns of Morgagni)** but not the anal valves themselves, which are located at the base of these columns. - This region is lined by columnar epithelium and is relatively insensitive to pain.
Question 9: Which zone of the prostate is primarily involved in Benign Prostatic Hyperplasia (BPH)?
- A. Central zone
- B. Peripheral zone
- C. Transitional zone (Correct Answer)
- D. Prostate capsule
Explanation: ***Transitional zone*** - The **transitional zone** surrounds the urethra and is the primary site of origin and enlargement in **Benign Prostatic Hyperplasia (BPH)**. - Its hypertrophy leads to compression of the urethra, causing **lower urinary tract symptoms (LUTS)**. *Central zone* - The **central zone** surrounds the ejaculatory ducts and is less commonly involved in BPH. - It is more frequently associated with the development of **prostate carcinoma**. *Peripheral zone* - The **peripheral zone** is the largest zone of the prostate and is where the majority of prostate cancers originate. - While it can be affected by BPH, it is not the primary zone for hypertrophy. *Prostate capsule* - The **prostate capsule** is the outer fibrous layer that encloses the prostate gland. - It does not undergo hyperplasia in BPH; rather, it encases the enlarging gland.
Question 10: All are true regarding course of ureter in pelvis except
- A. It is crossed by ovarian vessels where it enters true pelvis
- B. Ureter pierces lateral ligament where ureteric canal is developed.
- C. Ureter passes over bifurcation of common iliac artery
- D. Obturator vessels and nerve lie medially in relation to ureter at pelvic brim (Correct Answer)
Explanation: ***Obturator vessels and nerve lie medially in relation to ureter at pelvic brim*** - This statement is **FALSE** and is the correct answer to this "except" question. - The obturator nerve and vessels actually lie **laterally** (not medially) in relation to the ureter at the pelvic brim. - As the ureter descends into the pelvis, it crosses **anterior and medial** to the obturator nerve and vessels. - The obturator structures run along the **lateral pelvic wall** toward the obturator foramen. *It is crossed by ovarian vessels where it enters true pelvis* - This is **TRUE**. - The ovarian vessels cross anterior to the ureter at the pelvic brim as it enters the true pelvis [1]. - This is an important surgical landmark, particularly during **oophorectomy** and pelvic surgery to avoid ureteral injury [1]. - The relationship is remembered as "water (ureter) under the bridge (ovarian vessels)." *Ureter pierces lateral ligament where ureteric canal is developed* - This statement is **questionable** but may refer to the ureter's passage through the **parametrium** (base of broad ligament). - The ureter runs in the lateral parametrial tissue before passing beneath the uterine artery. - While not standard terminology, "ureteric canal" may refer to this passage through parametrial tissue. *Ureter passes over bifurcation of common iliac artery* - This is **TRUE**. - The ureter crosses **anterior** to the bifurcation of the common iliac artery at the pelvic brim. - This occurs at approximately the level of the **sacroiliac joint**. - This is a consistent and important anatomical landmark during pelvic and retroperitoneal surgery.
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