Pelvis and Perineum — MCQs

A 35-year-old man is admitted to the hospital after being kicked in the groin while playing football. During physical examination, it is noted that the left testicle of the patient is swollen. An MRI examination reveals coagulation of blood in the veins draining the testis. Into which of the following veins would a thrombus most likely pass first from the injured area?

Q65Medium

Which of the following statements about the lymphatics of the vulva is true?

Q66Medium

Which of the following is not enclosed within the mesorectal fascia?

Q67Easy

The internal pudendal artery gives rise to which of the following arteries?

Q68Easy

The internal pudendal artery is a branch of which division of the internal iliac artery?

Q69Easy

Which of the following is NOT true about nervi erigentes?

Q70Easy

The cortex of the ovary consists of all the following structures except:

Pelvis and Perineum Indian Medical PG Practice Questions and MCQs

Question 61: The hypogastric sheath is a condensation of which of the following structures?

A. Scarpa's fascia
B. Colle's fascia
C. Pelvic fascia (Correct Answer)
D. Inferior layer of the urogenital diaphragm

Explanation: The **hypogastric sheath** is a thick, band-like condensation of the **extraperitoneal pelvic fascia** (specifically the visceral pelvic fascia) [1]. It serves as a crucial neurovascular conduit, extending from the lateral pelvic wall to the pelvic viscera (bladder, rectum, and uterus/prostate). It transmits the internal iliac vessels and autonomic nerves, while also providing structural support to the pelvic organs [1]. **Analysis of Options:** * **Pelvic Fascia (Correct):** The pelvic fascia is divided into parietal and visceral layers. The hypogastric sheath is a specialized condensation of this fascia that divides into three laminae: the anterior (lateral ligament of the bladder), middle (cardinal/Mackenrodt’s ligament in females), and posterior (lateral ligament of the rectum) [1]. * **Scarpa’s Fascia:** This is the deep, membranous layer of the superficial fascia of the **abdominal wall**, not the pelvis. * **Colle’s Fascia:** This is the continuation of Scarpa’s fascia into the **perineum**. It forms the superficial boundary of the superficial perineal pouch. * **Inferior layer of the urogenital diaphragm:** Also known as the **perineal membrane**, this is a fibrous sheet that separates the deep and superficial perineal pouches. **High-Yield Clinical Pearls for NEET-PG:** * **Cardinal Ligament (Mackenrodt’s):** The middle lamina of the hypogastric sheath is the primary support for the uterus [1]. Damage to this leads to uterine prolapse. * **Ureter Relation:** The ureter passes through the hypogastric sheath, crossing *under* the uterine artery ("Water under the bridge") [1]. * **Presacral Space:** Surgeons use the plane between the parietal and visceral pelvic fascia (the "holy plane" of rectal surgery) to perform bloodless dissections.

Question 62: Which structure provides the weakest support to the uterus?

A. Uterosacral ligament
B. Round ligament
C. Broad ligament (Correct Answer)
D. Levator ani

Explanation: The uterus is maintained in its position by a combination of primary (mechanical) and secondary (peritoneal) supports [1]. **Why the Broad Ligament is the Correct Answer:** The **Broad ligament** is a double fold of peritoneum that extends from the sides of the uterus to the lateral pelvic walls. Because it is merely a peritoneal fold and not a true fibrous or muscular ligament, it provides **minimal to no functional support** in maintaining the uterus's position. It primarily acts as a "cloak" or conduit for the uterine tubes, vessels, and nerves. **Analysis of Incorrect Options:** * **Levator ani (Option D):** This is the **most important primary support** (active support). It forms the pelvic floor; its constant tone keeps the pelvic outlet closed and supports the pelvic viscera. * **Uterosacral ligament (Option A):** These are strong fibrous bands (true ligaments) that pull the cervix posteriorly toward the sacrum, helping maintain the anteverted position [1]. * **Round ligament (Option B):** While it doesn't prevent prolapse, it maintains the **anteflexion** of the uterus [2] by pulling the fundus forward toward the inguinal canal. It is significantly stronger than the broad ligament. **NEET-PG High-Yield Pearls:** * **Primary Support (Mechanical):** Divided into Muscular (Levator ani, Perineal body) and Visceral Pelvic Fascia (Mackenrodt’s/Cardinal ligaments, Uterosacral ligaments, Pubocervical ligaments) [1]. * **Mackenrodt’s (Transverse Cervical) Ligament:** The **main/strongest** ligamentous support of the uterus [1]. * **Secondary Support (Peritoneal):** Includes the Broad ligament and Vesicouterine/Rectouterine folds. These are considered "false" ligaments. * **Uterine Position:** Normal position is **Anteverted** (90° angle between vagina and cervix) and **Anteflexed** (120° angle between cervix and body) [2].

Question 63: A broad flat pelvis is characteristic of which type?

A. Gynaecoid type
B. Android type
C. Anthropoid type
D. Platypelloid type (Correct Answer)

Explanation: The classification of the female pelvis is based on the **Caldwell-Moloy system**, which categorizes pelves into four types based on the shape of the pelvic inlet [1]. **1. Why Platypelloid is correct:** The **Platypelloid pelvis** is described as a **"broad, flat"** pelvis [2]. It is characterized by a significantly increased transverse diameter and a shortened anteroposterior (AP) diameter [1], [2]. This gives the inlet a kidney-shaped or flattened oval appearance. It is the rarest type (occurring in <3% of women) and often leads to a persistent transverse position of the fetal head during labor [2]. **2. Analysis of Incorrect Options:** * **Gynaecoid (A):** The typical "female" pelvis (50% of women) [3]. It has a **round or slightly oval** inlet with a wide subpubic angle [1]. It is the most favorable for vaginal delivery. * **Android (B):** The "male-pattern" pelvis (20% of women) [3]. It has a **heart-shaped** inlet, a narrow subpubic angle, and prominent ischial spines [1]. It is associated with increased instrumental deliveries and "deep transverse arrest" [3]. * **Anthropoid (C):** The "ape-like" pelvis (25% of women) [3]. It has a **long AP diameter** and a narrow transverse diameter — the opposite of platypelloid [1]. It is associated with "occipito-posterior" (OP) positions of the fetal head [3]. **3. High-Yield Facts for NEET-PG:** * **Most common type:** Gynaecoid. * **Least common type:** Platypelloid. * **Deep Transverse Arrest:** Most common in Android pelvis. * **Non-engagement of head:** Common in Platypelloid due to the narrow AP diameter [2]. * **Sacrum:** In Platypelloid, the sacrum is short and hollow; in Anthropoid, it is long and narrow [3].

Question 64: A 35-year-old man is admitted to the hospital after being kicked in the groin while playing football. During physical examination, it is noted that the left testicle of the patient is swollen. An MRI examination reveals coagulation of blood in the veins draining the testis. Into which of the following veins would a thrombus most likely pass first from the injured area?

A. Inferior vena cava
B. Left renal vein (Correct Answer)
C. Left inferior epigastric vein
D. Left internal pudendal vein

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The venous drainage of the testes is asymmetrical, which is a high-yield anatomical concept. The veins emerging from the testis and epididymis form the **pampiniform plexus**. As this plexus ascends through the inguinal canal, it condenses into a single **testicular vein**. * **On the Left side:** The left testicular vein drains into the **left renal vein** at a right angle (90°). * **On the Right side:** The right testicular vein drains directly into the **inferior vena cava (IVC)** at an acute angle. Since the patient has an injury and thrombus involving the **left** testicle, the blood (and any potential thrombus) will travel superiorly and pass first into the **left renal vein**. **2. Why the Other Options are Wrong:** * **A. Inferior vena cava:** This would be the first destination for a thrombus originating from the **right** testis. On the left, the blood must pass through the renal vein before reaching the IVC. * **C. Left inferior epigastric vein:** This vein drains the anterior abdominal wall and empties into the external iliac vein; it is not part of the primary venous drainage of the testis. * **D. Left internal pudendal vein:** This vein drains the perineum and external genitalia (like the scrotum and penis) into the internal iliac vein, but it does not drain the testis itself. **3. Clinical Pearls for NEET-PG:** * **Varicocele:** More common on the **left side** because the left testicular vein enters the renal vein at a right angle, leading to higher hydrostatic pressure and slower flow compared to the right side. * **Renal Cell Carcinoma (RCC):** A tumor in the left kidney can invade the left renal vein, obstructing the left testicular vein and causing a "sudden onset left-sided varicocele." * **Lymphatic Drainage:** Remember that while veins differ, the lymphatic drainage for **both** testes goes to the **Para-aortic (Pre-aortic) lymph nodes**, not the inguinal nodes.

Question 65: Which of the following statements about the lymphatics of the vulva is true?

A. Lymphatics of the vulva do not cross the labiocrural fold.
B. Lymphatics of the vulva traverse the labia from medial to lateral. (Correct Answer)
C. Lymphatics of the vulva drain directly into deep femoral glands.
D. Lymphatics of the vulva do not freely communicate with each other.

Explanation: ### Explanation The lymphatic drainage of the vulva follows a highly predictable and clinically significant pattern, primarily directed toward the **inguinal lymph nodes**. **1. Why Option B is Correct:** Lymphatic vessels in the vulva originate in the superficial tissues and **traverse the labia from a medial to lateral direction**. They collect in the subcutaneous tissues of the labia majora and then travel superiorly toward the mons pubis before draining into the superficial inguinal nodes. **2. Analysis of Incorrect Options:** * **Option A:** Lymphatics **do cross** the labiocrural fold. They travel laterally from the labia majora across this fold to reach the inguinal region. * **Option C:** Drainage is **indirect**. Vulvar lymphatics first drain into the **superficial inguinal nodes** (specifically the medial group). From there, they pass through the cribriform fascia to the **deep femoral nodes** (e.g., Cloquet’s node) and then to the external iliac nodes. * **Option D:** There is **extensive communication** and contralateral drainage. Lymphatics from one side of the vulva (especially the midline structures like the clitoris and perineum) freely cross the midline to drain into the contralateral inguinal nodes. **3. Clinical Pearls for NEET-PG:** * **Way’s Rule:** Vulvar cancer typically spreads in a stepwise fashion: Superficial Inguinal → Deep Inguinal (Cloquet’s) → External Iliac. * **The Clitoris Exception:** While most vulvar drainage is superficial, the glans clitoris may drain directly to the **deep femoral nodes** or even the internal iliac nodes. [1] * **Sentinel Node:** The superficial inguinal nodes are the first-line "sentinel" nodes for vulvar malignancies. * **Midline Rule:** Any lesion near the midline (clitoris, fourchette) requires bilateral inguinal node evaluation due to the free communication of lymphatics.

Question 66: Which of the following is not enclosed within the mesorectal fascia?

A. Pararectal nodes
B. Superior rectal vein
C. Inferior rectal vein (Correct Answer)
D. Inferior mesenteric plexus

Explanation: The **mesorectum** is a fatty connective tissue envelope surrounding the rectum, bounded by the **mesorectal fascia** (a continuation of the pelvic fascia). Understanding its contents is crucial for oncological surgeries like Total Mesorectal Excision (TME). [1] ### Why the Inferior Rectal Vein is the Correct Answer: The **Inferior rectal vein** is a tributary of the internal pudendal vein (systemic circulation). It originates near the anal canal, below the levator ani muscle, and travels within the **Alcock’s canal (pudendal canal)** and the ischioanal fossa. Therefore, it lies outside the mesorectal fascia. [1] ### Why the Other Options are Incorrect: * **Pararectal nodes:** These are the primary lymphatic drainage stations for the rectum and are located within the mesorectal fat, making them a critical component to remove during cancer surgery. * **Superior rectal vein:** This is the direct continuation of the inferior mesenteric vein. It descends within the sigmoid mesocolon and enters the mesorectum to drain the rectal mucosa. [1] * **Inferior mesenteric plexus:** The autonomic nerve fibers (sympathetic and parasympathetic) follow the superior rectal artery into the mesorectum to supply the rectal wall. ### High-Yield Clinical Pearls for NEET-PG: * **Total Mesorectal Excision (TME):** This is the "gold standard" surgical technique for rectal cancer. The surgeon must stay in the "holy plane" (the avascular plane between the mesorectal fascia and the parietal pelvic fascia) to ensure complete removal of lymph nodes and avoid bleeding. * **Blood Supply:** The **Superior rectal artery** (terminal branch of IMA) is the main artery within the mesorectum. * **Venous Drainage:** The Superior rectal vein drains into the **Portal system**, while Middle and Inferior rectal veins drain into the **Systemic system** (Internal Iliac/Pudendal). [1] This creates a clinically significant portosystemic anastomosis.

Question 67: The internal pudendal artery gives rise to which of the following arteries?

A. Superior rectal artery
B. Middle rectal artery
C. Inferior rectal artery (Correct Answer)
D. Median sacral artery

Explanation: **Explanation:** The **internal pudendal artery** is a terminal branch of the anterior division of the internal iliac artery. It exits the pelvis through the greater sciatic foramen and enters the perineum via the lesser sciatic foramen, passing through the **pudendal (Alcock’s) canal**. Within this canal, it gives off the **inferior rectal artery**, which pierces the medial wall of the canal to supply the lower half of the anal canal (below the pectinate line), the anal sphincters, and the perianal skin. **Analysis of Incorrect Options:** * **A. Superior rectal artery:** This is the direct continuation of the **inferior mesenteric artery**. It supplies the upper part of the rectum. * **B. Middle rectal artery:** This arises directly from the **internal iliac artery** (anterior division). It supplies the middle and lower rectum and forms an important anastomosis between the portal and systemic circulations. * **C. Median sacral artery:** This is a small, unpaired branch arising from the **posterior aspect of the abdominal aorta**, just above its bifurcation. **High-Yield NEET-PG Pearls:** * **The Rectal Blood Supply Rule:** The rectum is supplied by three arteries from three different sources: Superior (IMA), Middle (Internal Iliac), and Inferior (Internal Pudendal). * **Pudendal Nerve:** Like the artery, the pudendal nerve also gives off the inferior rectal nerve, which provides motor supply to the external anal sphincter and sensory supply below the pectinate line. * **Clinical Correlation:** In cases of ischioanal abscess drainage, the internal pudendal vessels and nerve are protected by their location in the lateral wall of the ischioanal fossa (Alcock’s canal).

Question 68: The internal pudendal artery is a branch of which division of the internal iliac artery?

A. Anterior division (Correct Answer)
B. Posterior division
C. Anterior division of external iliac
D. Posterior division of external iliac

Explanation: **Explanation:** The **internal iliac artery** is the principal artery of the pelvis. It typically divides at the upper border of the greater sciatic notch into two divisions: **Anterior** and **Posterior**. **1. Why the Correct Answer is Right:** The **Internal Pudendal Artery** is a terminal branch of the **Anterior Division** of the internal iliac artery. It exits the pelvis through the greater sciatic foramen (below the piriformis), enters the gluteal region, and then re-enters the perineum via the lesser sciatic foramen to supply the external genitalia and perineal muscles. **2. Why the Incorrect Options are Wrong:** * **Posterior Division:** This division primarily supplies the body wall and posterior pelvic muscles. Its branches are limited to three: **I**liolumbar, **L**ateral sacral, and **S**uperior gluteal arteries (Mnemonic: **ILS**). * **External Iliac Artery (Options C & D):** The external iliac artery does not have "anterior" or "posterior" divisions. It continues as the femoral artery and primarily supplies the lower limb, with its only two branches being the inferior epigastric and deep circumflex iliac arteries. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Mnemonic for Anterior Division Branches:** "**O**ften **I**t **I**s **V**ery **M**any **U**nhealthy **A**rteries" (**O**bturator, **I**nferior gluteal, **I**nternal pudendal, **V**esical (superior/inferior), **M**iddle rectal, **U**terine/Vaginal). * **Alcock’s Canal:** The internal pudendal artery runs within the pudendal canal (Alcock’s canal) along the lateral wall of the ischioanal fossa. * **Crucial Landmark:** The internal pudendal artery crosses the **sacrospinous ligament** as it moves from the greater to the lesser sciatic foramen. * **Comparison:** The **Superior Gluteal Artery** is the largest branch of the *Posterior* division, while the **Inferior Gluteal Artery** is a branch of the *Anterior* division.

Question 69: Which of the following is NOT true about nervi erigentes?

A. They are autonomic nerves.
B. They represent parasympathetic outflow.
C. They arise from the ventral rami of S2, S3, and S4.
D. They join the superior hypogastric plexus. (Correct Answer)

Explanation: **Explanation:** The **nervi erigentes** (also known as pelvic splanchnic nerves) are the primary mediators of the parasympathetic supply to the pelvic viscera and the distal hindgut. **Why Option D is Correct (The False Statement):** Nervi erigentes do **not** join the superior hypogastric plexus. Instead, they join the **inferior hypogastric plexus** (pelvic plexus). The superior hypogastric plexus is located at the bifurcation of the aorta and consists almost entirely of sympathetic fibers. The inferior hypogastric plexus is where sympathetic fibers (from the hypogastric nerves) and parasympathetic fibers (from nervi erigentes) merge to distribute to pelvic organs. **Analysis of Other Options:** * **Option A & B:** These are correct. Nervi erigentes are **autonomic** nerves representing the **sacral parasympathetic outflow** (craniosacral system). * **Option C:** This is correct. They arise from the **ventral rami of S2, S3, and S4** spinal nerves. These preganglionic fibers travel to the pelvic plexus to synapse in terminal ganglia within or near the organ walls. **High-Yield Clinical Pearls for NEET-PG:** * **Function:** Their name "erigentes" refers to their role in **erection** (vasodilation of corpora cavernosa). Remember: **P**oint (Parasympathetic/Erection) and **S**hoot (Sympathetic/Ejaculation). * **Supply:** They provide motor supply to the bladder wall (detrusor) and inhibitory supply to the internal urethral sphincter, facilitating micturition. * **Surgical Significance:** During radical pelvic surgeries (like prostatectomy or rectal resection), damage to these nerves leads to **impotence** and bladder dysfunction. * **Hindgut Supply:** They provide parasympathetic innervation to the gastrointestinal tract from the distal 1/3rd of the transverse colon down to the upper anal canal.

Question 70: The cortex of the ovary consists of all the following structures except:

A. Graafian follicle
B. Hilus (Correct Answer)
C. Primordial follicle
D. Corpus luteum

Explanation: ### Explanation The ovary is structurally divided into two distinct zones: an outer **cortex** and an inner **medulla** [1]. **1. Why "Hilus" is the correct answer:** The **Hilus** (or Hilum) is the part of the ovary where blood vessels, nerves, and lymphatics enter and exit. It is continuous with the **medulla**, the central core of the ovary. The medulla consists of loose connective tissue, elastic fibers, and large convoluted blood vessels. Crucially, the hilus also contains **Hilus cells** (homologous to Leydig cells in males), which secrete androgens. Therefore, the hilus is a medullary structure, not a cortical one. **2. Analysis of Incorrect Options:** * **Cortex Composition:** The cortex is the peripheral layer containing the **ovarian follicles** embedded in a cellular connective tissue stroma [1]. * **Primordial Follicles (Option C):** These are the most immature follicles found in the superficial cortex [2]. * **Graafian Follicle (Option A):** This is the mature, liquid-filled follicle ready for ovulation, located within the cortex. * **Corpus Luteum (Option D):** This is the temporary endocrine structure formed from the remains of the ovarian follicle after ovulation, also residing in the cortex [2]. **3. NEET-PG High-Yield Pearls:** * **Germinal Epithelium:** The ovary is covered by a single layer of cuboidal cells (modified peritoneum) called the germinal epithelium of Waldeyer [1]. * **Tunica Albuginea:** A dense connective tissue layer located between the germinal epithelium and the cortex. * **Hilus Cell Tumors:** These are rare androgen-secreting tumors that can cause virilization in women; they are characterized by the presence of **Reinke crystals** (similar to Leydig cell tumors). * **Blood Supply:** The ovarian artery arises directly from the **Abdominal Aorta** at the level of L2.

Practice by Chapter

Pelvic Walls and Floor

Practice Questions

Pelvic Viscera

Practice Questions

Urogenital Organs

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Pelvic Vasculature

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Pelvic Innervation

Practice Questions

Male Perineum

Practice Questions

Female Perineum

Practice Questions

Pelvic Lymphatics

Practice Questions

Applied Anatomy and Clinical Correlations

Practice Questions

Gender Differences in Pelvic Anatomy

Practice Questions

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