Pelvis and Perineum — MCQs

Pelvis and Perineum Indian Medical PG Practice Questions and MCQs

Question 571: 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 572: Ovarian fossa is formed by all except?

A. Internal iliac artery
B. Ureter
C. Obliterated umbilical artery
D. Round ligament of ovary (Correct Answer)

Explanation: ***Round ligament of ovary*** - The **round ligament of ovary** (ovarian ligament) connects the ovary to the lateral wall of the uterus and does NOT form any boundary of the ovarian fossa [1]. - It lies medial to the ovary and is not involved in forming the depression of the ovarian fossa [1]. - This ligament anchors the ovary but is separate from the peritoneal boundaries defining the fossa [1]. *Obliterated umbilical artery* - The **obliterated umbilical artery** (medial umbilical ligament) forms the **anterior boundary** of the ovarian fossa [2]. - This is a key anatomical landmark running along the lateral pelvic wall anterior to the ovary [2]. *Internal iliac artery* - The **internal iliac artery** forms the **posterior boundary** of the ovarian fossa [2]. - It lies on the lateral pelvic wall, deep and posterior to the ovarian fossa [2]. - This is one of the main structures defining the fossa's posterior limit [2]. *Ureter* - The **ureter** runs along the lateral pelvic wall and forms part of the **posterior/floor boundary** of the ovarian fossa [2]. - It passes posteroinferior to the ovary, contributing to the fossa's posterior limits [2].

Question 573: In patients with penile or urethral injury, Colle's fascia prevents extravasation of urine from spreading into which anatomical space?

A. Superficial perineal space
B. None of the options
C. Ischiorectal fossa (Correct Answer)
D. Abdomen

Explanation: ***Ischiorectal fossa*** - Colle's fascia (superficial perineal fascia) is the membranous layer that defines the boundaries of the **superficial perineal space**. - When urethral injury occurs, urine extravasates into the superficial perineal space but is **prevented from spreading laterally and posteriorly** into the ischiorectal fossa because Colle's fascia fuses with the **ischiopubic rami** laterally and the **perineal membrane** posteriorly [1]. - The ischiorectal fossa is a space lateral to the **anal canal** that is separated from the superficial perineal space by these fascial attachments. *Superficial perineal space* - This is actually the space **into which** urine extravasates when penile or urethral injury occurs, not the space that is protected from extravasation [1]. - Colle's fascia forms the inferior boundary of this space, so urine collects here rather than being prevented from entering. *Abdomen* - Colle's fascia in the perineum is continuous with **Scarpa's fascia** of the anterior abdominal wall. - Due to this continuity, urine can actually **track superiorly** into the anterior abdominal wall along this fascial plane. - Therefore, Colle's fascia does NOT prevent spread to the abdomen. *None of the options* - This option is incorrect because Colle's fascia specifically prevents lateral and posterior spread into the ischiorectal fossa through its anatomical attachments.

Question 574: Waldeyer's fascia lies?

A. In front of the bladder.
B. Behind the rectum. (Correct Answer)
C. Between the bladder and uterus.
D. Between the uterus and rectum.

Explanation: ***Behind the rectum*** - **Waldeyer’s fascia**, also known as the **sacrorectal fascia**, is a retrorectal connective tissue sheet located between the **rectum** and the **sacrum**. - It plays a crucial role in supporting the rectum and forms part of the posterior rectosacral space, separating the rectum from the sacral bone and nerves. *In front of the bladder* - The space in front of the bladder is typically referred to as the **retropubic space of Retzius**, containing loose connective tissue and fat. - No specific fascial layer named Waldeyer's fascia is located in this anterior position relative to the bladder. *Between the bladder and uterus* - This space, known as the **vesicouterine pouch** or **anterior cul-de-sac**, is a peritoneal reflection between the bladder and the uterus [1]. - It does not contain a structure known as Waldeyer's fascia. *Between the uterus and rectum* - This space is the **rectouterine pouch** or **Pouch of Douglas**, which is the deepest part of the peritoneal cavity in females [2]. - While important surgically, it does not correspond to the location of Waldeyer's fascia.

Question 575: Where is the Bartholin gland situated?

A. Superficial perineal pouch (Correct Answer)
B. Deep perineal pouch
C. Inguinal canal
D. Ischiorectal fossa

Explanation: ***Superficial perineal pouch*** - The **Bartholin glands** are located posterolateral to the vaginal orifice within the boundaries of the **superficial perineal pouch** [1]. - They are covered by the **bulbospongiosus muscle** and their ducts open into the vestibule of the vagina [1]. *Deep perineal pouch* - This pouch contains structures like the **urethra**, part of the **vagina**, and the **deep transverse perineal muscle**, but not the Bartholin glands [2]. - It is located superior to the superficial perineal pouch and separated by the **perineal membrane**. *Inguinal canal* - The **inguinal canal** is a passage in the anterior abdominal wall that transmits the **round ligament of the uterus** in females and the **spermatic cord** in males. - It is anatomically distinct from the perineum and does not house the Bartholin glands. *Ischiorectal fossa* - The **ischiorectal fossae** are fat-filled spaces located lateral to the anal canal, inferior to the levator ani muscles. - They are known for their susceptibility to abscess formation but do not contain the Bartholin glands.

Question 576: Which of the following branches of the internal iliac artery has the LEAST contribution to the blood supply of the ureter?

A. Middle rectal artery
B. Vaginal artery
C. Obturator artery
D. Superior vesicular artery (Correct Answer)

Explanation: ***Superior vesical artery*** - The superior vesical artery primarily supplies the **superior part of the urinary bladder** [1] and, in males, the **ductus deferens**. - While it may occasionally provide **minor branches to the distal ureter** near the bladder, its contribution to the overall ureteral blood supply is **minimal and inconsistent**. - Among the options listed, it has the **least recognized contribution** to the ureter, as its primary focus is vesical (bladder) supply. *Middle rectal artery* - The middle rectal artery supplies the **middle and inferior rectum**, **prostate** (in males), and **seminal vesicles**. - It provides **recognized branches to the distal ureter**, particularly in the pelvic region, forming part of the collateral vascular network. - This contribution is more consistent than that of the superior vesical artery. *Vaginal artery* - The vaginal artery (in females) is a **major contributor** to the blood supply of the **distal ureter**, along with the vagina, bladder base, and rectum. - It is the female equivalent of the inferior vesical artery (in males), both of which are **primary sources** of distal ureteral blood supply. - This is the most significant contributor among the options in females. *Obturator artery* - The obturator artery primarily supplies the **medial thigh muscles** and **hip joint**. - It may send **small variable branches** to the pelvic ureter during its course through the pelvis [2], but this is more consistent than the superior vesical contribution. - It provides recognized, though minor, supply to the pelvic portion of the ureter.

Question 577: Which of the following structures does not pass through the greater sciatic foramen?

A. Piriformis
B. Superior gluteal nerve
C. Inferior gluteal nerve
D. Obturator nerve (Correct Answer)

Explanation: ***Obturator nerve*** - The **obturator nerve** passes through the **obturator foramen** into the medial compartment of the thigh, not the greater sciatic foramen. - Its primary function is to innervate the **adductor muscles** of the thigh and provide sensory innervation to the medial thigh. *Piriformis* - The **piriformis muscle** passes through the **greater sciatic foramen**, dividing it into suprapiriform and infrapiriform spaces. - It runs from the anterior surface of the **sacrum** to the greater trochanter of the femur. *Superior gluteal nerve* - The **superior gluteal nerve** passes through the **suprapiriform part** of the greater sciatic foramen. - It innervates the **gluteus minimus**, **gluteus medius**, and **tensor fasciae latae muscles**. *Inferior gluteal nerve* - The **inferior gluteal nerve** passes through the **infrapiriform part** of the greater sciatic foramen. - It specifically innervates the **gluteus maximus muscle**.

Question 578: Occlusion of which artery would result in insufficient perfusion of the urinary bladder?

A. Internal iliac (Correct Answer)
B. External iliac
C. Renal
D. Suprarenal

Explanation: ***Internal iliac*** - The **internal iliac artery** is the primary source of blood supply to the pelvic organs, including the urinary bladder, through its anterior division branches like the superior and inferior vesical arteries [2]. - Occlusion of this artery would directly compromise the blood flow necessary for bladder perfusion [2]. *External iliac* - The **external iliac artery** primarily supplies the lower limbs and does not directly contribute to the perfusion of the urinary bladder. - Its branches, such as the inferior epigastric and deep circumflex iliac arteries, supply structures of the abdominal wall and lower limb [1]. *Renal* - The **renal arteries** supply the kidneys and adrenal glands, with no direct contribution to the vascularization of the urinary bladder. - Occlusion of a renal artery would affect kidney function, not bladder perfusion. *Suprarenal* - The **suprarenal arteries** (superior, middle, and inferior) supply the adrenal glands located superior to the kidneys. - They are not involved in the blood supply to the urinary bladder.

Question 579: Which of the following structures does not cross the dorsal surface of the ischial spine?

A. Internal pudendal vessel
B. Pudendal nerve
C. Obturator nerve (Correct Answer)
D. Nerve to obturator internus

Explanation: ***Obturator nerve*** - The **obturator nerve** passes through the **obturator foramen** to supply the medial compartment of the thigh, and therefore does not interact with the ischial spine. - It arises from the **lumbar plexus (L2-L4)** and descends anterior to the sacroiliac joint. *Internal pudendal vessel* - The **internal pudendal artery and vein** exit the pelvis through the greater sciatic foramen, wrap around the **ischial spine**, and re-enter the pelvis through the lesser sciatic foramen. - They lie in close proximity to the ischial spine as they traverse this path to reach the perineum. *Pudendal nerve* - The **pudendal nerve (S2-S4)** also exits the greater sciatic foramen, loops around the **ischial spine**, and enters the lesser sciatic foramen to innervate the perineum. - This anatomical relationship makes it susceptible to injury during procedures involving the ischial spine, such as sacral nerve stimulation. *Nerve to obturator internus* - The **nerve to obturator internus** exits the pelvis via the greater sciatic foramen, crosses the posterior aspect of the **ischial spine**, and then enters the lesser sciatic foramen to supply the obturator internus muscle. - This nerve is often injured during pelvic trauma or certain surgical procedures.

Question 580: All of the following are contents of the deep perineal pouch EXCEPT:

A. External urethral sphincter
B. Bulb of penis (Correct Answer)
C. Dorsal nerve of penis
D. Bulbourethral glands

Explanation: ***Bulb of penis*** - The **bulb of the penis** is part of the **erectile tissue** located in the **superficial perineal pouch**, not the deep perineal pouch. - It lies inferior to the perineal membrane and is therefore NOT a content of the deep perineal pouch. *External urethral sphincter* - The **external urethral sphincter** (sphincter urethrae) is a **skeletal muscle** that surrounds the **membranous urethra** within the **deep perineal pouch**. - It provides voluntary control of urination. *Bulbourethral glands* - The **bulbourethral glands (Cowper's glands)** are located within the **deep perineal pouch** in males. - They lie posterolateral to the membranous urethra and secrete pre-ejaculate fluid. *Dorsal nerve of penis* - The **dorsal nerve of the penis** (terminal branch of the pudendal nerve) passes through the **deep perineal pouch** before reaching the dorsum of the penis. - It provides sensory innervation to the penile skin.

Practice by Chapter

Pelvic Walls and Floor

Practice Questions

Pelvic Viscera

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Urogenital Organs

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Pelvic Vasculature

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Pelvic Innervation

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Male Perineum

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Female Perineum

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Pelvic Lymphatics

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Applied Anatomy and Clinical Correlations

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Gender Differences in Pelvic Anatomy

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