Pelvis and Perineum — MCQs

Pelvis and Perineum Indian Medical PG Practice Questions and MCQs

Question 381: Cowper glands are found in which part of the urethra?

A. Prostatic part
B. Membranous part (Correct Answer)
C. Penile part
D. Interior

Explanation: The **Cowper glands** (also known as **Bulbourethral glands**) are two small, pea-sized exocrine glands in the male reproductive system. **Why the Membranous part is correct:** The Cowper glands are anatomically situated within the **deep perineal pouch**. They are embedded among the fibers of the sphincter urethrae muscle, which surrounds the **membranous urethra**. Therefore, the glands themselves are located in the membranous part of the urethra. **Analysis of Incorrect Options:** * **A. Prostatic part:** This part contains the openings of the prostatic ducts and the ejaculatory ducts (at the seminal colliculus), but not the Cowper glands. * **C. Penile (Spongy) part:** While the Cowper glands are *located* in the membranous part, their **ducts** travel downward to open into the floor of the **bulbar portion of the penile urethra**. It is a common examiner trap to confuse the location of the gland (membranous) with the location of its duct opening (penile). * **D. Interior:** This is a non-specific anatomical term and does not describe a distinct segment of the male urethra. **High-Yield NEET-PG Pearls:** * **Homology:** The Cowper glands in males are homologous to the **Bartholin glands** in females [1]. However, note the difference: Bartholin glands are located in the superficial perineal pouch, while Cowper glands are in the deep perineal pouch. * **Function:** They secrete a clear, alkaline pre-ejaculate fluid that neutralizes residual acidity in the urethra (from urine) and provides lubrication [1]. * **Duct Length:** The ducts of these glands are approximately 3 cm long before they pierce the bulb of the penis to enter the spongy urethra.

Question 382: The vaginal artery arising from the anterior division of the hypogastric artery corresponds to which of the following in males?

A. Inferior vesical artery (Correct Answer)
B. Superior vesical artery
C. Deep dorsal artery of the penis
D. Dorsal artery of the penis

Explanation: The **vaginal artery** in females is the homologue of the **inferior vesical artery** in males. Both vessels typically arise from the anterior division of the internal iliac (hypogastric) artery [1]. 1. **Why Option A is correct:** In males, the inferior vesical artery supplies the fundus of the bladder, prostate, and seminal vesicles [1]. In females, the vaginal artery takes its place, supplying the vagina and the base of the bladder. While females occasionally have a small inferior vesical artery, the vaginal artery is the primary functional equivalent that descends to the pelvic floor. 2. **Why the other options are incorrect:** * **Superior vesical artery (B):** This artery is present in both sexes and arises from the patent proximal part of the umbilical artery. It supplies the superior aspect of the bladder [1]. * **Deep dorsal and Dorsal arteries of the penis (C & D):** These are terminal branches of the **internal pudendal artery**. Their female homologues are the deep and dorsal arteries of the clitoris. **High-Yield NEET-PG Pearls:** * **Uterine Artery Homologue:** The uterine artery in females corresponds to the **ductus deferens artery** (artery to the vas deferens) in males. * **Water Under the Bridge:** The uterine artery crosses **superior** to the ureter. In males, the ductus deferens crosses superior to the ureter. * **Internal Iliac Divisions:** Remember that the anterior division gives off mostly visceral branches (Obturator, Umbilical, Inferior Vesical/Vaginal, Uterine, Middle Rectal, Internal Pudendal, and Inferior Gluteal) [1].

Question 383: Which of the following organs has a fibromuscular stroma?

A. Testis
B. Liver
C. Prostate (Correct Answer)
D. Urinary bladder

Explanation: The **Prostate** is a unique gland characterized by a dense **fibromuscular stroma**, which constitutes approximately one-third of the gland's total volume. This stroma is composed of a mixture of collagenous fibrous tissue and smooth muscle fibers. The contraction of these smooth muscle fibers, stimulated by sympathetic nerves during ejaculation, helps squeeze prostatic secretions into the prostatic urethra. **Analysis of Options:** * **Testis (Option A):** The testis is primarily composed of seminiferous tubules (parenchyma) enclosed by a thick fibrous capsule called the *tunica albuginea*. It lacks a significant muscular component within its internal stroma. * **Liver (Option B):** The liver is a parenchymatous organ. Its structural framework consists of a thin connective tissue capsule (*Glisson’s capsule*) and a delicate reticular fiber network, but it does not contain a muscular stroma. * **Urinary Bladder (Option C):** While the bladder has a thick muscular wall (the *detrusor muscle*), it is a hollow viscus, not a solid organ with a fibromuscular stroma [1]. Its structure is organized into distinct layers (mucosa, submucosa, muscularis, and serosa) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Zonal Anatomy:** The prostate is divided into zones (McNeal’s classification). **Benign Prostatic Hyperplasia (BPH)** typically occurs in the **Transition Zone**, while **Prostatic Carcinoma** most commonly arises in the **Peripheral Zone**. * **Histology:** On H&E staining, the prostate is easily identified by its glandular acini lined by a double layer of epithelium (basal and luminal) embedded in the characteristic pink-staining fibromuscular stroma. * **Prostatic Concretions:** Look for *Corpora Amylacea* (calcified proteinaceous bodies) in the glandular lumina, which increase with age.

Question 384: A 78-year-old man has carcinoma of the rectum. The cancer is most likely to metastasize via the veins into which of the following structures?

A. Spleen
B. Kidney
C. Liver (Correct Answer)
D. Duodenum

Explanation: The correct answer is **Liver**. This is based on the anatomy of the venous drainage of the gastrointestinal tract and the **Portal Venous System**. The rectum has a dual venous drainage: 1. **Superior Rectal Vein:** Drains the upper part of the rectum into the **Inferior Mesenteric Vein**, which then joins the **Portal Vein**. 2. **Middle and Inferior Rectal Veins:** Drain into the Internal Iliac veins (Systemic circulation). Since the majority of the rectal venous blood (especially from the upper rectum) enters the portal circulation, malignant cells are carried directly to the **liver**, which acts as the first capillary bed they encounter. This makes the liver the most common site for hematogenous metastasis in colorectal cancers. **Analysis of Incorrect Options:** * **A. Spleen:** While the splenic vein is part of the portal system, blood flows *from* the spleen to the portal vein, not vice versa. Metastasis here is rare. * **B. Kidney:** The kidneys belong to the systemic circulation. Rectal cancer would only reach the kidneys after passing through the liver and lungs. * **C. Duodenum:** There is no direct venous pathway from the rectum to the duodenum. **High-Yield Clinical Pearls for NEET-PG:** * **Portosystemic Anastomosis:** The rectum is a key site for portosystemic shunt. In portal hypertension, the anastomosis between the Superior Rectal (Portal) and Middle/Inferior Rectal (Systemic) veins leads to **Internal Hemorrhoids**. * **Lymphatic Spread:** Above the pectinate line, lymph drains to **Internal Iliac nodes**; below it, to **Superficial Inguinal nodes**. * **Rule of Thumb:** Cancers of the GI tract (esophagus to upper rectum) primarily metastasize to the **liver** via the portal vein.

Question 385: Which structure is not contained within, or attached to, the broad ligament?

A. The suspensory ligament of the ovary (Correct Answer)
B. The round ligament
C. The uterine artery
D. The fallopian tube

Explanation: The **broad ligament** is a double layer of peritoneum (mesentery) that extends from the sides of the uterus to the lateral pelvic walls and floor [1]. It serves as a "cloak" draped over several pelvic structures. ### **Why Option A is Correct** The **suspensory ligament of the ovary** (infundibulopelvic ligament) is not contained *within* the broad ligament; rather, it is a fold of peritoneum that extends upwards from the ovary to the lateral pelvic wall [1]. It contains the ovarian artery, vein, and nerve plexus. While it is continuous with the broad ligament, it is anatomically considered a separate superior extension that anchors the ovary to the pelvic brim. ### **Why Other Options are Incorrect** * **B. Round Ligament:** This structure originates at the uterine horns and travels **within** the layers of the broad ligament (specifically the mesometrium) before exiting through the deep inguinal ring. * **C. Uterine Artery:** This major vessel travels medially within the **base of the broad ligament** (the cardinal ligament or Mackenrodt’s ligament) to reach the cervix and uterus [3]. * **D. Fallopian Tube:** The uterine tube is located along the **superior free margin** of the broad ligament, enclosed within a specific part called the **mesosalpinx** [1], [2]. ### **High-Yield NEET-PG Pearls** * **Subdivisions:** The broad ligament has three parts: **Mesometrium** (largest part, surrounds uterus), **Mesovarium** (carries vessels to ovary), and **Mesosalpinx** (surrounds fallopian tube) [1]. * **Ureter Relation:** The ureter passes **under** the uterine artery ("water under the bridge") within the base of the broad ligament [3]. * **Contents:** Other contents include the epoophoron, paroophoron (vestigial remnants), and the ovarian ligament [2].

Question 386: The sympathetic supply of the fallopian tube and ovary is derived from which spinal nerve segments?

A. T6 - T8
B. T8 - T10
C. T10 - T12 (Correct Answer)
D. L2 - L4

Explanation: The autonomic nerve supply to the pelvic organs is a high-yield topic for NEET-PG. The sympathetic innervation of the **ovary and fallopian tube** is primarily derived from the **T10 to T12** spinal segments. **1. Why T10 - T12 is Correct:** The ovaries and the lateral portions of the fallopian tubes develop embryologically in the upper posterior abdominal wall near the level of the kidneys (L1-L2) before descending into the pelvis. Consequently, they retain their original nerve supply and lymphatic drainage [1]. The preganglionic sympathetic fibers originate from the **T10–T12 segments**, travel via the **lesser and least splanchnic nerves**, and synapse in the **aorticorenal and superior mesenteric ganglia**. Postganglionic fibers [1] then reach the organs via the ovarian plexus [1]. **2. Analysis of Incorrect Options:** * **T6 - T8 (Option A):** These segments provide sympathetic supply to the upper GI tract (stomach, liver, pancreas) via the greater splanchnic nerve. * **T8 - T10 (Option B):** These segments primarily supply the midgut structures, such as the small intestine and the ascending colon. * **L2 - L4 (Option C):** These segments contribute to the sympathetic supply of the lower pelvic viscera (like the distal colon and rectum) via the lumbar splanchnic nerves, but they are not the primary supply for the ovaries. **3. High-Yield Clinical Pearls for NEET-PG:** * **Referred Pain:** Because the ovary is supplied by T10, ovarian pain is often referred to the **umbilicus** (the T10 dermatome). * **Lymphatic Drainage:** Following its embryological origin, the ovary drains into the **Para-aortic (Pre-aortic) lymph nodes**, not the inguinal or iliac nodes [1]. * **Parasympathetic Supply:** The ovaries receive parasympathetic fibers from the **Vagus nerve (CN X)** via the ovarian plexus, unlike most pelvic organs which are supplied by the Pelvic Splanchnic nerves (S2-S4).

Question 387: Which of the following is a false statement regarding the anthropoid pelvis?

A. Anteroposterior diameter is greater than the transverse diameter.
B. Ischial spines are prominent. (Correct Answer)
C. Subpubic angle is wide.
D. Sacrosciatic notch is shallow and wide.

Explanation: The **Anthropoid pelvis** is one of the four classic types of female pelves described by Caldwell and Moloy [1]. It is characterized by an oval-shaped inlet where the **anteroposterior (AP) diameter is greater than the transverse diameter**, resembling the pelvis of great apes [1]. ### Why the Correct Answer is Right: In an Anthropoid pelvis, the **ischial spines are typically blunt (not prominent)** [1]. Prominent or "encroaching" ischial spines are a hallmark feature of the **Android (masculine) pelvis**, which often leads to transverse arrest during labor. Therefore, the statement that ischial spines are prominent in an anthropoid pelvis is false. ### Analysis of Other Options: * **Option A:** True. The defining feature of the anthropoid pelvis is its long AP diameter and relatively narrow transverse diameter [1]. * **Option C:** True. The subpubic angle in an anthropoid pelvis is generally **wide or normal**, unlike the narrow, acute angle seen in the android pelvis [1]. * **Option D:** True. The sacrosciatic notch in the anthropoid pelvis is typically **large, shallow, and wide**, providing more posterior space [1]. ### NEET-PG High-Yield Pearls: * **Gynecoid:** Most common (50%); ideal for delivery; round inlet; wide subpubic angle. * **Android:** Heart-shaped inlet; prominent ischial spines; narrow subpubic angle; increased risk of instrumental delivery. * **Anthropoid:** Oval inlet (AP > Transverse); common in non-white races; associated with **occipito-posterior (OP) position** of the fetus [2]. * **Platypelloid:** Rarest; kidney-shaped inlet (Transverse > AP); flat pelvis.

Question 388: What is the primary blood supply of the uterus?

A. Ovarian artery
B. Uterine artery
C. Both ovarian and uterine arteries (Correct Answer)
D. None of the above

Explanation: **Explanation:** The blood supply of the uterus is a classic example of **collateral circulation** and arterial anastomosis [1]. While the **uterine artery** (a branch of the internal iliac artery) provides the majority of the blood flow, the **ovarian artery** (a direct branch of the abdominal aorta) contributes significantly, especially to the fundus and upper body of the uterus [1], [2]. **Why the correct answer is C:** The uterine artery travels within the cardinal ligament and crosses the ureter ("water under the bridge") to reach the cervix. It then ascends along the lateral border of the uterus. At the level of the fundus, it forms a robust **anastomosis** with the ovarian artery [1], [2]. Therefore, the uterus receives a dual supply from both sources, ensuring adequate perfusion during pregnancy and providing a compensatory mechanism if one vessel is compromised. **Analysis of incorrect options:** * **Option A (Ovarian artery):** While it supplies the fundus, it is not the sole provider. It primarily supplies the ovaries and fallopian tubes. * **Option B (Uterine artery):** Although it is the *major* contributor, selecting it alone ignores the significant physiological contribution of the ovarian artery, making "Both" the more accurate anatomical answer. **High-Yield NEET-PG Pearls:** 1. **Ureteric Relation:** The uterine artery passes **superior** to the ureter [2]. This is a critical landmark during a hysterectomy to avoid accidental ureteric ligation. 2. **Origin:** Uterine artery arises from the **anterior division** of the internal iliac artery [1]. 3. **Spiral Arteries:** These are the terminal branches of the uterine artery within the endometrium that undergo shedding during menstruation [1]. 4. **Sampson’s Artery:** A small branch of the uterine artery located in the round ligament; it is a potential source of bleeding during surgery.

Question 389: The artery supplying the ductus deferens arises from which of the following structures?

A. Aorta
B. Inferior epigastric artery
C. Inferior vesical artery (Correct Answer)
D. Pudendal artery

Explanation: The **artery to the ductus deferens** (deferential artery) is a long, slender branch that supplies the vas deferens and the epididymis. It typically arises from the **superior vesical artery** or the **inferior vesical artery** (which are branches of the anterior division of the internal iliac artery). In the context of standard anatomical variations frequently tested in NEET-PG, the inferior vesical artery is the most commonly cited origin in males. **Why the correct option is right:** * **Inferior vesical artery:** This artery supplies the fundus of the bladder, prostate, and seminal vesicles. It provides the deferential artery, which travels within the spermatic cord to anastomose with the testicular artery, ensuring collateral circulation to the testis. **Why the other options are wrong:** * **Aorta:** The aorta gives rise to the **testicular arteries** (at the level of L2), not the artery to the ductus deferens. * **Inferior epigastric artery:** This artery (a branch of the external iliac) gives rise to the **cremasteric artery**, which supplies the fascial coverings of the spermatic cord. * **Pudendal artery:** The internal pudendal artery primarily supplies the perineum and external genitalia (e.g., the dorsal artery of the penis) but does not supply the ductus deferens. **Clinical Pearls for NEET-PG:** * **Dual Blood Supply:** The testis has a triple blood supply: 1. Testicular artery (Aorta), 2. Artery to ductus deferens (Inferior/Superior Vesical), and 3. Cremasteric artery (Inferior epigastric). * **Surgical Significance:** During a vasectomy, the artery to the ductus deferens is usually ligated along with the vas. * **Collateral Circulation:** Because of the anastomosis between the testicular and deferential arteries, the testis may remain viable even if the main testicular artery is accidentally ligated (though this is not guaranteed).

Question 390: What is the nerve root of the pudendal nerve?

A. S1, S2, S3
B. S2, S3, S4 (Correct Answer)
C. S3-S4
D. S2-S3

Explanation: **Explanation:** The **pudendal nerve** is the main nerve of the perineum and the chief sensory nerve of the external genitalia. It originates from the **ventral rami of the second, third, and fourth sacral nerves (S2, S3, S4)**. **1. Why S2, S3, S4 is Correct:** The pudendal nerve arises from the sacral plexus. These specific nerve roots provide the necessary somatic motor and sensory fibers to the pelvic floor and perineum. A classic mnemonic to remember this is: *"S2, 3, 4 keeps the poop off the floor,"* referring to its role in supplying the external anal sphincter. **2. Analysis of Incorrect Options:** * **S1, S2, S3:** These roots contribute to the sciatic nerve and the posterior cutaneous nerve of the thigh, but S1 does not contribute to the pudendal nerve. * **S3-S4:** While these roots are part of the pudendal nerve, they exclude S2, which is a major component. S3 and S4 also contribute to the nerve to levator ani. * **S2-S3:** This is incomplete as it misses the S4 contribution, which is essential for the inferior rectal branch. **3. Clinical Pearls for NEET-PG:** * **Course:** It leaves the pelvis through the **greater sciatic foramen** (inferior to the piriformis), crosses the ischial spine, and re-enters through the **lesser sciatic foramen**. * **Alcock’s Canal:** It runs within the pudendal canal (fascial sheath on the lateral wall of the ischiorectal fossa). * **Pudendal Nerve Block:** Performed by infiltrating local anesthetic near the **ischial spine**. This is used for analgesia during the second stage of labor and episiotomies. * **Branches:** It divides into three terminal branches: the inferior rectal nerve, the perineal nerve, and the dorsal nerve of the penis/clitoris.

Practice by Chapter

Pelvic Walls and Floor

Practice Questions

Pelvic Viscera

Practice Questions

Urogenital Organs

Practice Questions

Pelvic Vasculature

Practice Questions

Pelvic Innervation

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Male Perineum

Practice Questions

Female Perineum

Practice Questions

Pelvic Lymphatics

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Applied Anatomy and Clinical Correlations

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Gender Differences in Pelvic Anatomy

Practice Questions

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