Pelvis and Perineum Practice Questions

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

Internal iliac. ***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.

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

Obturator nerve. ***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.

Q: If a missile enters the body just above the pubic ramus through the anterior abdominal wall, it will most likely pierce which of the following structures?

Urinary bladder. ***Urinary bladder*** - A missile entering just above the **pubic ramus** through the **anterior abdominal wall** is directly in the anatomical region of the **urinary bladder**, especially when distended [1], [2]. - The **urinary bladder** is located in the **pelvis** posterior to the **pubic symphysis**, making it highly vulnerable to injury from anterior pelvic trauma [2]. *Abdominal aorta* - The **abdominal aorta** is a retroperitoneal structure located much deeper and more posteriorly in the abdominal cavity. - For the **abdominal aorta** to be injured from this entry point, the missile would need to traverse a significant portion of the abdominal cavity, which is less likely than bladder injury. *Left renal vein* - The **left renal vein** is located in the retroperitoneum at the level of the L1-L2 vertebrae, well above the pubic ramus. - Injury to the **left renal vein** from a missile entering just above the pubic ramus is anatomically improbable due to the significant vertical distance. *Spinal cord* - The **spinal cord** is located within the vertebral canal, protected by the bony vertebral column, and is a posterior structure. - An anterior missile entry point above the pubic ramus would have to pass through the entire body to reach the **spinal cord**, making it an extremely unlikely target.

Q: Order the following structures of the fallopian tube from lateral to medial:

Infundibulum-Ampulla-Isthmus-Interstitial. ***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.

Q: All of the following are contents of the deep perineal pouch EXCEPT:

Bulb of penis. ***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.

Q: The pudendal nerve is related to:

Ischial spine. ***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.

Q: 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?

Infundibulopelvic ligament. ***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].

Q: Which arteries contribute to the vascular supply of the vulva?

All of the options. ***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

Q: The area bounded by the clitoris, fourchette, and labia minora is

Vestibule. ***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 1

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

Accepted Answer

Internal iliac

Answer

External iliac

Answer

Renal

Answer

Suprarenal

Question 2

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

Accepted Answer

Obturator nerve

Answer

Internal pudendal vessel

Answer

Pudendal nerve

Answer

Nerve to obturator internus

Question 3

If a missile enters the body just above the pubic ramus through the anterior abdominal wall, it will most likely pierce which of the following structures?

Accepted Answer

Urinary bladder

Answer

Abdominal aorta

Answer

Left renal vein

Answer

Spinal cord

Question 4

Which of the following statements about the anatomy of the Fallopian tubes is true?

Accepted Answer

Lateral to medial structures are fimbriae, ampulla, isthmus, interstitial part

Answer

Length is 20 cm

Answer

All of the options

Answer

Medial to lateral structures are isthmus, interstitial part, ampulla & fimbriae

Question 5

Order the following structures of the fallopian tube from lateral to medial:

Accepted Answer

Infundibulum-Ampulla-Isthmus-Interstitial

Answer

Isthmus-Infundibulum-Ampulla-Interstitial

Answer

Ampulla-Isthmus-Infundibulum-Interstitial

Answer

Ampulla-Infundibulum-Isthmus-Interstitial

Question 6

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

Accepted Answer

Bulb of penis

Answer

External urethral sphincter

Answer

Dorsal nerve of penis

Answer

Bulbourethral glands

Question 7

The pudendal nerve is related to:

Accepted Answer

Ischial spine

Answer

Sacral promontory

Answer

Iliac crest

Answer

Ischial tuberosity

Question 8

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?

Accepted Answer

Infundibulopelvic ligament

Answer

Round ligament

Answer

Ovarian ligament

Answer

Mesosalpinx

Question 9

Which arteries contribute to the vascular supply of the vulva?

Accepted Answer

All of the options

Answer

Inferior vesicle artery

Answer

Vaginal artery

Answer

Internal pudendal artery

Question 10

The area bounded by the clitoris, fourchette, and labia minora is

Accepted Answer

Vestibule

Answer

Fourchette

Answer

Vulva

Answer

Fossa navicularis

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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