Pelvis and Perineum — MCQs
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The pudendal nerve is related to:
A patient underwent surgery for an ovarian mass diagnosed on ultrasound, with negative tumor markers. At laparotomy, peritoneal washings were taken, and after thorough inspection of the abdomen, an ipsilateral salpingo-oophorectomy was performed. The lateral end of the pedicle is formed of which structure?
Which arteries contribute to the vascular supply of the vulva?
The area bounded by the clitoris, fourchette, and labia minora is
The branches of the anterior division of the internal iliac artery include all except.
The internal anal sphincter is formed by:
Which of the following statements about the sphincter urethrae is false?
Which of the following statements about the Levator Ani is false?
Which of the following statements about the pudendal nerve is true?
Injury to the male urethra below the perineal membrane causes urine to accumulate in which of the following spaces?
Pelvis and Perineum Indian Medical PG Practice Questions and MCQs
Question 581: The pudendal nerve is related to:
- A. Ischial spine (Correct Answer)
- B. Sacral promontory
- C. Iliac crest
- D. Ischial tuberosity
Explanation: ***Ischial spine*** - The **pudendal nerve** wraps around the ischial spine and then passes through the lesser sciatic foramen. - Due to its anatomical proximity, the ischial spine is a key landmark for administering a **pudendal nerve block**. *Sacral promontory* - The **sacral promontory** is the anterior-most projection of the S1 vertebra; it is a bony landmark for pelvic measurements but not directly associated with the pudendal nerve's course or blockade. - It serves as a superior boundary of the **pelvic inlet**, far removed from the pudendal nerve's path in the perineum. *Iliac crest* - The **iliac crest** is the superior border of the ilium, a large bone of the pelvis, and serves as an attachment site for many muscles. - It is located much higher than the pudendal nerve and plays no direct role in its anatomical relations or clinical access. *Ischial tuberosity* - The **ischial tuberosity** is a bony projection of the ischium, known as the "sitz bone," and is an attachment site for hamstring muscles. - Although part of the ischium, the pudendal nerve does not directly wrap around or use the ischial tuberosity as a primary landmark for its course or block.
Question 582: A patient underwent surgery for an ovarian mass diagnosed on ultrasound, with negative tumor markers. At laparotomy, peritoneal washings were taken, and after thorough inspection of the abdomen, an ipsilateral salpingo-oophorectomy was performed. The lateral end of the pedicle is formed of which structure?
- A. Round ligament
- B. Ovarian ligament
- C. Mesosalpinx
- D. Infundibulopelvic ligament (Correct Answer)
Explanation: ***Infundibulopelvic ligament*** - The **infundibulopelvic ligament (suspensory ligament of the ovary)** forms the lateral boundary of the ovarian pedicle, which contains the **ovarian artery** and **vein** [2]. - During an oophorectomy, this ligament is ligated and divided to ensure complete removal of the ovary and control of major blood supply [3]. *Round ligament* - The **round ligament of the uterus** extends from the uterus to the labia majora and is involved in supporting the uterus, not the ovarian pedicle [4]. - It runs within the broad ligament and attaches to the uterus, inferior to the origin of the fallopian tubes. *Ovarian ligament* - The **ovarian ligament (utero-ovarian ligament)** connects the ovary to the uterus and forms the medial boundary of the ovarian pedicle [4]. - It is distinct from the lateral pedicle and is typically ligated separately during oophorectomy [4]. *Mesosalpinx* - The **mesosalpinx** is the portion of the broad ligament that encloses the fallopian tube [1]. - It does not form the lateral aspect of the ovarian pedicle itself, but rather supports the fallopian tube superior to the ovary [1].
Question 583: Which arteries contribute to the vascular supply of the vulva?
- A. Inferior vesicle artery
- B. Vaginal artery
- C. Internal pudendal artery
- D. All of the options (Correct Answer)
Explanation: ***All of the options (All three arteries listed contribute)*** - The **inferior vesical artery**, **vaginal artery**, and **internal pudendal artery** all contribute to the vascular supply of the vulva. - Together, these vessels form part of the rich vascular network supplying the external female genitalia. - **Note:** The external pudendal artery (from the femoral artery) also contributes significantly via anterior labial branches. *Inferior vesical artery* - Branch of the **internal iliac artery** that primarily supplies the bladder - Provides minor contributions to the **lower vagina and vulva** in females - Part of the internal iliac arterial supply to the region *Vaginal artery* - Branch of the **internal iliac artery** - Major blood supply to the **vagina** with branches extending to the **posterior vulva** - Works in anastomotic network with other pelvic vessels *Internal pudendal artery* - **Primary arterial supply** to the perineum and external genitalia - Gives rise to the **posterior labial arteries**, **deep and dorsal arteries of the clitoris**, and **artery of the vestibular bulb** - Most clinically significant vessel for vulvar blood supply
Question 584: The area bounded by the clitoris, fourchette, and labia minora is
- A. Vestibule (Correct Answer)
- B. Fourchette
- C. Vulva
- D. Fossa navicularis
Explanation: ***Vestibule*** - The **vestibule** is the functional name given to the area bounded by the **clitoris**, **fourchette** (posterior commissure), and the **labia minora**. It contains the openings of the urethra and vagina [1]. - This region is crucial for both **sexual function** and **reproduction**, as it houses structures vital for these processes [1]. *Fourchette (anatomical landmark)* - The **fourchette** is the posterior junction of the **labia minora** and is part of the perineum but does not define the entire bounded area in question. - It is a **specific anatomical landmark**, whereas the question asks for a region defined by multiple boundaries, including the fourchette itself. *Vulva (external female genitalia)* - The **vulva** is the entire external female genitalia, encompassing the **labia majora**, **labia minora**, **clitoris**, and **vestibule** [2]. - It represents a **broader anatomical region** than the specific area described, which is internal to the labia minora [2]. *Fossa navicularis (a recess within the vestibule)* - The **fossa navicularis** is a small, boat-shaped depression located in the **vestibule**, specifically between the fourchette and the vaginal opening. - While it is **within the described area**, it is only a small recess and not the entire bounded region itself.
Question 585: The branches of the anterior division of the internal iliac artery include all except.
- A. Superior gluteal (Correct Answer)
- B. Uterine
- C. Obturator
- D. Internal pudendal
Explanation: **Superior gluteal** - The **superior gluteal artery** is a branch of the **posterior division** of the internal iliac artery. - It exits the pelvis through the **greater sciatic foramen**, above the piriformis muscle, to supply the **gluteal muscles**. *Internal pudendal* - The internal pudendal artery is a prominent branch of the **anterior division** of the internal iliac artery. - It supplies structures in the **perineum** and external genitalia. *Uterine* - The uterine artery is a branch of the **anterior division** of the internal iliac artery in females. - It is crucial for supplying blood to the **uterus** and parts of the vagina. *Obturator* - The obturator artery is a branch of the **anterior division** of the internal iliac artery. - It passes through the **obturator canal** to supply the adductor muscles of the thigh.
Question 586: The internal anal sphincter is formed by:
- A. Circular muscle fibers (Correct Answer)
- B. Puborectalis muscle
- C. Longitudinal muscle fibers
- D. External anal sphincter
Explanation: ***Circular muscle fibers*** - The internal anal sphincter is a continuation and thickening of the **inner circular smooth muscle layer** of the rectum. - It is an **involuntary muscle**, innervated by the autonomic nervous system, playing a crucial role in maintaining continence at rest [1]. *Puborectalis muscle* - This muscle is part of the **levator ani muscle complex** and forms a sling around the anorectal junction, contributing to the anorectal angle [1]. - It is a **striated skeletal muscle** and is under voluntary control, primarily involved in maintaining continence during increased intra-abdominal pressure [1]. *Longitudinal muscle fibers* - The **longitudinal smooth muscle layer** of the rectum continues downwards as the conjoined longitudinal muscle. - This layer interdigitates with the puborectalis muscle and passes between the internal and external anal sphincters. *External anal sphincter* - The external anal sphincter is a **striated skeletal muscle** under voluntary control, located external to the internal anal sphincter [1]. - Unlike the internal sphincter (smooth muscle from circular layer), the external sphincter is formed by skeletal muscle and is responsible for voluntary continence [1].
Question 587: Which of the following statements about the sphincter urethrae is false?
- A. Voluntary
- B. Originates from the pelvic diaphragm
- C. Located at bladder neck (Correct Answer)
- D. Supplied by the internal pudendal nerve
Explanation: ***Located at bladder neck*** - The **external urethral sphincter** (sphincter urethrae) is located in the **deep perineal pouch** (urogenital diaphragm), surrounding the membranous urethra, **NOT at the bladder neck**. - The **internal urethral sphincter** (involuntary smooth muscle) is located at the **bladder neck** in males, but the external sphincter is distinctly separate and more distal [1]. - This statement is **FALSE** and is the correct answer. *Voluntary* - The **sphincter urethrae** (external urethral sphincter) is composed of **skeletal muscle** and is under **voluntary control** [1]. - This voluntary control is essential for **urinary continence** and allows conscious interruption of urination. *Originates from the pelvic diaphragm* - The **external urethral sphincter** is located in the **deep perineal pouch**, which is **separate from and inferior to** the **pelvic diaphragm** (levator ani and coccygeus). - While this statement could be considered anatomically imprecise, the sphincter is more accurately described as part of the **urogenital diaphragm** rather than originating from the pelvic diaphragm proper. - It is intimately associated with the **perineal membrane** and other muscles of the deep perineal pouch. *Supplied by the internal pudendal nerve* - The **pudendal nerve** (specifically the **perineal branch**) provides **somatic motor innervation** to the external urethral sphincter. - This innervation allows **voluntary contraction** and relaxation of the sphincter during micturition.
Question 588: Which of the following statements about the Levator Ani is false?
- A. Converges downwards & medially
- B. Attached to the pelvic brim. (Correct Answer)
- C. Made up of iliococcygeus, pubococcygeus, and puborectalis.
- D. Supports pelvic viscera.
Explanation: Attached to the pelvic brim - This statement is **false** because the levator ani does not attach to the pelvic brim (the inlet of the true pelvis). - The levator ani originates from: the **posterior surface of the body of pubis**, the **tendinous arch of obturator fascia** (thickening of obturator fascia on lateral pelvic wall), and the **ischial spine**. - All these attachments are on the **lateral pelvic wall below the pelvic brim**, not at the pelvic brim itself. - The muscles insert into the **perineal body**, **anococcygeal ligament**, and walls of pelvic viscera. *Converges downwards & medially* - This statement is **true** - the levator ani muscles arise from lateral attachments on the pelvic sidewalls and converge **medially and downward** toward the midline. - This creates the characteristic **funnel-shaped pelvic diaphragm** that narrows inferiorly. - The fibers run inferomedially to form a muscular sling supporting pelvic structures. *Supports pelvic viscera* - This is the **primary function** of the levator ani muscle group [1]. - It forms a muscular floor that supports the **bladder, uterus/prostate, and rectum**, preventing prolapse. - The muscle maintains the position of pelvic organs against intra-abdominal pressure. *Made up of iliococcygeus, pubococcygeus, and puborectalis* - This statement is **correct** - the levator ani consists of three main components [1]: - **Puborectalis** - forms a sling around the anorectal junction, important for fecal continence [1]. - **Pubococcygeus** - middle portion, supports pelvic viscera [1]. - **Iliococcygeus** - most posterior portion, extends from ischial spine to coccyx [1].
Question 589: Which of the following statements about the pudendal nerve is true?
- A. Enters the pelvis through the lesser sciatic foramen only.
- B. Runs in a canal formed by the levator ani fascia.
- C. Has a dorsal nerve branch which provides sensory innervation to the clitoris/penis. (Correct Answer)
- D. Has a dorsal branch which provides motor innervation to the glans penis.
Explanation: ***Has a dorsal nerve branch which provides sensory innervation to the clitoris/penis.*** - The **dorsal nerve of the clitoris** (in females) or **dorsal nerve of the penis** (in males) is a terminal branch of the pudendal nerve that provides the **primary sensory innervation** to the clitoris or glans penis. - This nerve travels along the dorsal surface of these structures and is responsible for sexual sensation. - Understanding this anatomy is clinically important for pudendal nerve blocks and surgical procedures in the perineal region. *Enters the pelvis through the lesser sciatic foramen only.* - The pudendal nerve actually **exits** the pelvis through the **greater sciatic foramen** inferior to the piriformis muscle, then immediately curves around the **ischial spine** and **re-enters** the perineum through the **lesser sciatic foramen**. - This characteristic course around the ischial spine is crucial for understanding pudendal nerve blocks, where local anesthetic is injected near the ischial spine. *Runs in a canal formed by the levator ani fascia.* - The pudendal nerve runs within the **pudendal canal (Alcock's canal)**, which is formed by a splitting of the **obturator internus fascia**, not the levator ani fascia. - This canal is located on the lateral wall of the ischiorectal fossa and is a key anatomical landmark for understanding pudendal nerve entrapment (cyclist's syndrome). *Has a dorsal branch which provides motor innervation to the glans penis.* - The **dorsal nerve of the penis** (or clitoris in females) provides **sensory innervation** to the glans, not motor innervation. - The **motor innervation** to perineal muscles (external anal sphincter, external urethral sphincter, bulbospongiosus, ischiocavernosus) comes from the **muscular branches** and **perineal nerve** branches of the pudendal nerve, not the dorsal nerve.
Question 590: Injury to the male urethra below the perineal membrane causes urine to accumulate in which of the following spaces?
- A. Superficial perineal pouch (Correct Answer)
- B. Deep perineal pouch
- C. Space of Retzius
- D. Pouch of Douglas
Explanation: **Superficial perineal pouch** - An injury to the male urethra below the **perineal membrane** (specifically, the spongy urethra) allows urine to extravasate into the **superficial perineal pouch** [1]. - This space is bounded by the **perineal membrane** superiorly, the **dartos fascia** of the scrotum, and the **fascia of Colles** laterally and inferiorly, determining the extent of urine accumulation [1]. *Deep perineal pouch* - An injury to the urethra within the **deep perineal pouch** (membranous urethra) would lead to extravasation into this space, but not the superficial pouch below the perineal membrane [1]. - This pouch is located superior to the **perineal membrane** and contains structures like the external urethral sphincter and bulbourethral glands. *Space of Retzius* - The **space of Retzius (retropubic space)** is located between the pubic symphysis and the bladder. - Urine accumulation here typically occurs with an **extraperitoneal bladder rupture**, not urethral injury below the perineal membrane. *Pouch of Douglas* - The **pouch of Douglas (recto-uterine pouch)** is the deepest part of the female peritoneal cavity, between the rectum and the uterus. - It is not relevant to male urethral injuries or urine extravasate for an injury at this location.
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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