Pelvis and Perineum Practice Questions

Q: A patient with external hemorrhoids develops pain while passing stools. Which of the following nerve mediates this pain?

Pudendal nerve. ***Pudendal nerve*** - The **pudendal nerve** provides **somatic innervation** to the entire perineum, including the **anal canal** and external hemorrhoids, making it responsible for perception of sharp pain. - External hemorrhoids are located **distal to the dentate line**, in a richly innervated area of the anus by somatic nerves, primarily derived from the pudendal nerve. *Hypogastric nerve* - The **hypogastric nerves** are part of the **autonomic nervous system** and primarily carry **visceral afferent** and efferent fibers to pelvic organs. - They are involved in sensations like stretching and fullness but do not mediate sharp, localized pain from external structures like hemorrhoids. *Sympathetic plexus* - The **sympathetic plexus** (e.g., inferior mesenteric plexus, superior hypogastric plexus) primarily carries **visceral afferent fibers** from internal organs. - These fibers contribute to diffuse, poorly localized visceral pain and not the sharp somatic pain associated with external hemorrhoids. *Splanchnic visceral nerve* - **Splanchnic nerves** are part of the **autonomic nervous system** and mainly transmit **visceral sensation** from abdominal and pelvic organs. - They are responsible for sensations like cramping and dull pain in internal organs but do not innervate the skin and somatic structures like external hemorrhoids.

Q: Which of the following statements about the trigone of the bladder is false?

Internal urethral orifice lies at lateral angle of base. ***Internal urethral orifice lies at lateral angle of base*** - The **internal urethral orifice** is located at the **apex** of the trigone, leading into the urethra [1]. - The **lateral angles** of the trigone are defined by the openings of the **ureters**, where they enter the bladder [1]. *Lined by transitional epithelium* - The entire **urinary bladder**, including the trigone, is lined by **transitional epithelium** (urothelium) [1]. - This specialized epithelium allows the bladder to **stretch and recoil** as it fills and empties. *Mucosa is smooth and firmly adherent* - The **mucosa of the trigone** is characteristically **smooth** and lacks the rugae (folds) found in the rest of the bladder. - It is **firmly adherent** to the underlying detrusor muscle, preventing it from folding when the bladder contracts. *Developed from the mesonephric duct* - The embryonic origin of the **trigone** is primarily from the caudal ends of the **mesonephric ducts** (Wolffian ducts). - This distinguishes it embryologically from the rest of the bladder, which develops from the **urogenital sinus**.

Q: Inferior rectal artery is a branch of?

Internal pudendal artery. ***Internal pudendal artery*** - The **inferior rectal artery** is a direct branch of the internal pudendal artery which supplies the anal canal [1]. - The **internal pudendal artery** is a branch of the internal iliac artery, supplying structures in the perineum [1]. *Inferior mesenteric artery* - The inferior mesenteric artery supplies the **distal transverse colon**, descending colon, sigmoid colon, and superior part of the rectum (via the superior rectal artery) [1]. - It does not directly supply the lower anal canal, which is the domain of the inferior rectal artery. *Superior mesenteric artery* - The superior mesenteric artery supplies the **small intestine** and the **proximal large intestine** up to the transverse colon [1]. - It supplies the midgut derivatives and is not involved in supplying the rectum or anal canal directly. *Coeliac trunk* - The coeliac trunk is the main arterial supply to the **foregut** organs, including the stomach, liver, spleen, and pancreas [1]. - It does not supply any part of the rectum or anal canal.

Q: What is the depth from the skin surface to reach the lower part of the sacroiliac joint in females?

2 to 2 1/2 cm. ***2 to 2 1/2 cm*** - In females, the **depth from the skin surface** to reach the **lower part of the sacroiliac joint** is typically **2 to 2.5 cm**. - This anatomical measurement is crucial for procedures like **sacroiliac joint injections**, ultrasound-guided techniques, and diagnostic imaging. - This depth applies to the posterior approach at the level of the posterior superior iliac spine (PSIS). *1 to 1 1/2 cm* - This measurement is generally **too shallow** to accurately reach the sacroiliac joint in females. - At this depth, the needle or probe would likely still be within **superficial soft tissues** (skin, subcutaneous fat, and superficial fascia). *3 to 3 1/2 cm* - This range is usually **too deep** for accessing the lower part of the sacroiliac joint in females. - This depth might penetrate **beyond the joint space** into deeper pelvic structures. *4 to 4 1/2 cm* - This measurement would be significantly **deeper** than necessary to reach the sacroiliac joint in females. - Such excessive depth could result in complications, including penetration of the joint capsule into the **pelvic cavity** or injury to **neurovascular structures**.

Q: Which ligament extends from the cervix and vagina to the lateral pelvic wall?

Transverse cervical ligament. ***Transverse cervical ligament*** - Also known as **Mackenrodt's ligament**, it provides a primary support for the uterus by extending from the cervix and vagina to the lateral pelvic wall [1]. - It contains the **uterine artery** and veins, contributing to both structural support and vascular supply [1]. *Broad ligament* - This is a wide fold of peritoneum that drapes over the uterus, fallopian tubes, and ovaries. - It does not directly attach the cervix or vagina to the lateral pelvic wall but rather provides a mesentery-like support for these organs [2]. *Pubocervical ligament* - This ligament extends from the cervix to the **pubic symphysis** anteriorly. - It primarily supports the anterior portion of the cervix and bladder, not extending to the lateral pelvic walls. *Round ligament* - This ligament extends from the **uterus**, through the inguinal canal, and attaches to the **labia majora**. - Its primary role is to maintain the anteversion of the uterus and it does not connect to the lateral pelvic wall in the manner described.

Q: What is the length of the posterior vaginal wall in centimeters?

Approximately 7.5 cm. ***Approximately 7.5 cm*** - The **posterior vaginal wall** is generally longer than the anterior wall. - This measurement is a common anatomical average for the posterior wall. *Approximately 5 cm* - This length is more typical of the **anterior vaginal wall**, which is usually shorter due to the cervix occupying a portion of the anterior fornix. - Therefore, this is an **underestimate** for the length of the posterior vaginal wall. *Less than 5 cm* - This measurement would be considered **unusually short** for a normal vagina, even for the anterior wall, and is incorrect for the posterior wall. - It does not represent the typical anatomical length of either wall. *More than 7.5 cm* - While vaginal length can vary, **significantly longer than 7.5 cm** is not the average measurement for the posterior wall. - This would represent an **overestimation** of the typical anatomical length.

Q: Superior rectal vein drains into?

Inferior mesenteric vein. ### Inferior mesenteric vein - The **superior rectal vein** drains blood from the **upper part of the rectum**. - It then ascends to directly join the **inferior mesenteric vein**, which is part of the **portal venous system** [1]. *External iliac vein* - The **external iliac vein** primarily drains structures from the **lower limb** [2]. - It does not directly receive venous drainage from the rectum. *Internal iliac vein* - The **internal iliac vein** drains structures from the **pelvic viscera**, including the **middle and inferior rectal veins**. - However, the superior rectal vein specifically drains into the portal system via the inferior mesenteric vein. *Internal pudendal vein* - The **internal pudendal vein** drains structures of the **perineum** and external genitalia. - It is not involved in draining the main rectal venous flow.

Q: Uvula vesicae is produced by which prostate lobe?

Median lobe of the prostate. ***Median lobe of the prostate*** - The **median lobe** of the prostate is located directly beneath the neck of the bladder and commonly hypertrophies, leading to the formation of the **uvula vesicae**. - The **uvula vesicae** is an elevation of the mucous membrane at the posterior aspect of the bladder neck, caused by the enlargement of the median lobe of the prostate. *Anterior lobe of the prostate* - The **anterior lobe** is usually fibromuscular and is not directly involved in the formation of the uvula vesicae. - It is typically the smallest and least significant lobe clinically in terms of causing outflow obstruction. *Posterior lobe of the prostate* - The **posterior lobe** is the most common site for prostate cancer but does not typically contribute to the formation of the uvula vesicae. - It lies behind the urethra and ejaculatory ducts and is palpable during a digital rectal exam. *Lateral lobe of the prostate* - The **lateral lobes** also contribute to benign prostatic hyperplasia (BPH) symptoms, but are not directly responsible for the localized elevation known as the uvula vesicae. - They are located on either side of the urethra and can enlarge to compress the urethra.

Q: Seminal colliculus is present in ?

Urethra. ***Correct: Urethra*** - The **seminal colliculus** (also known as the **verumontanum**) is a prominent ridge located on the posterior wall of the **prostatic urethra** - It contains the openings of the **ejaculatory ducts** and the **prostatic utricle** - This is a key anatomical landmark in the male urethra during endoscopic procedures *Incorrect: Prostate* - While the seminal colliculus is located within the portion of the urethra that passes through the prostate (prostatic urethra), it is not a structure *of* the prostate gland itself - The prostate is a gland that surrounds the urethra and contributes to seminal fluid - The seminal colliculus is an intraluminal urethral structure, not prostatic tissue *Incorrect: Testis* - The testis is the primary male reproductive organ responsible for **spermatogenesis** and hormone synthesis (testosterone) - It does not contain the seminal colliculus, which is located in the pelvic urethra *Incorrect: Scrotum* - The scrotum is an external dermal sac that houses the testes, epididymis, and lower spermatic cords - It provides temperature regulation for spermatogenesis - The seminal colliculus is an internal pelvic structure, not present in the scrotum

Question 1

A patient with external hemorrhoids develops pain while passing stools. Which of the following nerve mediates this pain?

Accepted Answer

Pudendal nerve

Answer

Hypogastric nerve

Answer

Sympathetic plexus

Answer

Splanchnic visceral nerve

Question 2

Which of the following statements about the trigone of the bladder is false?

Accepted Answer

Internal urethral orifice lies at lateral angle of base

Answer

Mucosa is smooth and firmly adherent.

Answer

Developed from the mesonephric duct.

Answer

Lined by transitional epithelium

Question 3

Inferior rectal artery is a branch of?

Accepted Answer

Internal pudendal artery

Answer

Inferior mesenteric artery

Answer

Superior mesenteric artery

Answer

Coeliac trunk

Question 4

What is the depth from the skin surface to reach the lower part of the sacroiliac joint in females?

Accepted Answer

2 to 2 1/2 cm

Answer

1 to 1 1/2 cm

Answer

3 to 3 1/2 cm

Answer

4 to 4 1/2 cm

Question 5

Which ligament extends from the cervix and vagina to the lateral pelvic wall?

Accepted Answer

Transverse cervical ligament

Answer

Broad ligament

Answer

Pubocervical ligament

Answer

Round ligament

Question 6

What is the length of the posterior vaginal wall in centimeters?

Accepted Answer

Approximately 7.5 cm

Answer

Approximately 5 cm

Answer

Less than 5 cm

Answer

More than 7.5 cm

Question 7

Superior rectal vein drains into?

Accepted Answer

Inferior mesenteric vein

Answer

External iliac vein

Answer

Internal iliac vein

Answer

Internal pudendal vein

Question 8

Uvula vesicae is produced by which prostate lobe?

Accepted Answer

Median lobe of the prostate

Answer

Anterior lobe of the prostate

Answer

Posterior lobe of the prostate

Answer

Lateral lobe of the prostate

Question 9

What is the significance of the term 'Corona mortis' in human anatomy?

Accepted Answer

Anastomosis between obturator and inferior epigastric vessels

Answer

Anastomosis between superior and inferior gluteal arteries

Answer

A ligament connecting the pubic symphysis

Answer

A nerve crossing the pelvic brim

Question 10

Seminal colliculus is present in ?

Accepted Answer

Urethra

Answer

Testis

Answer

Prostate

Answer

Scrotum

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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