Pelvis and Perineum — MCQs

Pelvis and Perineum Indian Medical PG Practice Questions and MCQs

Question 261: Which of the following is not a part of the broad ligament?

A. mesosalpinx
B. mesometrium
C. mesovarium
D. endometrium (Correct Answer)

Explanation: The **broad ligament** is a wide fold of peritoneum that connects the sides of the uterus to the walls and floor of the pelvis [2]. It acts as a "cloak" draped over the female reproductive organs. ### Why Endometrium is the Correct Answer The **endometrium** is the innermost mucosal lining of the uterine cavity [1]. It is a histological layer of the uterus itself, not a peritoneal reflection. Since the broad ligament is an external serous covering (peritoneum), the internal lining of the uterus cannot be a part of it. ### Explanation of Other Options The broad ligament is divided into three distinct regions based on the structures they support: * **Mesosalpinx:** The upper portion of the broad ligament that encloses and suspends the **fallopian (uterine) tubes** [2]. * **Mesovarium:** A posterior extension of the broad ligament that attaches to the **ovary**, carrying its blood vessels and nerves [2]. * **Mesometrium:** The largest part of the broad ligament, extending from the pelvic floor to the body of the **uterus** [3]. ### High-Yield Clinical Pearls for NEET-PG * **Contents of Broad Ligament:** It contains the uterine tube, round ligament of the uterus, ligament of the ovary, uterine and ovarian arteries/veins, and the ureter (crucial: the ureter passes "water under the bridge," i.e., under the uterine artery) [3]. * **Remnants:** It also contains vestigial remnants of the Wolffian duct (Epoophoron and Paroophoron). * **Suspensory Ligament of Ovary (Infundibulopelvic ligament):** This is the lateral extension of the broad ligament that contains the **ovarian artery**, a common site for ligation during oophorectomy [2].

Question 262: All of the following are coverings of a mature Graafian follicle, except?

A. Theca externa
B. Theca interna
C. Germinal cells (Correct Answer)
D. Granulosa cells

Explanation: ### Explanation The **Graafian follicle** is the mature, pre-ovulatory stage of follicular development. To identify its coverings, one must understand the histological layers that surround the oocyte as it matures within the ovary. **Why "Germinal cells" is the correct answer:** The term "Germinal cells" (or germinal epithelium) refers to the **simple cuboidal epithelium** that covers the **outer surface of the ovary** [1]. It is not a component or a covering of the individual Graafian follicle itself. Instead, it is a modified part of the peritoneum that lines the ovary. **Analysis of incorrect options:** * **Theca externa:** This is the outermost layer of the follicle, composed of fibrous connective tissue and smooth muscle cells. It helps in the contraction required for ovulation. * **Theca interna:** The vascularized inner layer of the theca, responsible for secreting androgens (androstenedione) which are later converted to estrogen [3]. * **Granulosa cells:** These are the stratified cuboidal cells lining the follicle. They possess aromatase enzymes to convert thecal androgens into estrogens and form the *cumulus oophorus* and *corona radiata* around the oocyte. **High-Yield Clinical Pearls for NEET-PG:** * **Theca Interna:** Site of LH action (produces androgens). * **Granulosa Cells:** Site of FSH action (converts androgens to estrogens). * **Antrum:** The fluid-filled cavity characteristic of secondary and Graafian follicles, containing *Liquor folliculi*. * **Stigma:** The point on the ovarian surface where the Graafian follicle ruptures during ovulation. * **Germinal Epithelium:** Despite its name, it does *not* give rise to germ cells (oocytes); germ cells migrate from the yolk sac endoderm [2]. Most ovarian cancers (70%) arise from this epithelial layer.

Question 263: Which of the following is not a component of the hypogastric sheath?

A. Broad ligament (Correct Answer)
B. Uterosacral ligament
C. Transverse cervical ligament
D. Lateral ligament of the bladder

Explanation: The **hypogastric sheath** is a thick band of pelvic fascia that conveys neurovascular structures from the lateral pelvic wall to the pelvic viscera [1]. It is divided into three distinct laminae (anterior, intermediate, and posterior), which form true supporting ligaments of the pelvic organs [1]. ### Why Broad Ligament is the Correct Answer The **Broad ligament** is a double layer of **peritoneum** (serous membrane), not a condensation of pelvic fascia [1]. While it drapes over the uterus and adnexa, it provides minimal structural support. In contrast, the hypogastric sheath consists of "true" ligaments formed by endopelvic fascia. ### Analysis of Other Options (Components of Hypogastric Sheath) * **Lateral ligament of the bladder (Anterior lamina):** This part of the sheath passes medially to the urinary bladder, carrying the superior vesical artery and vein [1]. * **Transverse cervical (Mackenrodt’s) ligament (Intermediate lamina):** Located at the base of the broad ligament, it transmits the uterine artery and provides the primary support for the cervix and uterus [1]. * **Uterosacral ligament (Posterior lamina):** This condensation of fascia extends from the cervix to the sacrum, forming the rectouterine fold and providing posterior support to the uterus [1]. ### High-Yield Clinical Pearls for NEET-PG * **Primary Support of Uterus:** The **Transverse Cervical (Cardinal) Ligament** is the most important ligament for preventing uterine prolapse [1]. * **Ureteric Relation:** The ureter passes through the hypogastric sheath, running **inferior** to the uterine artery ("Water under the bridge") within the transverse cervical ligament [1]. * **True vs. False Ligaments:** Always distinguish between **fascial (true)** ligaments (e.g., Cardinal, Uterosacral) and **peritoneal (false)** folds (e.g., Broad ligament, Round ligament) [1].

Question 264: What is the articular segment of the sacroiliac joint?

A. S1-2 (Correct Answer)
B. S3 1/2 - S4 1/4
C. S 1/2 - S4 1/2
D. None of the above

Explanation: ### Explanation The **sacroiliac joint (SIJ)** is a complex, atypical synovial joint formed between the auricular surfaces of the sacrum and the ilium. Understanding its anatomy is high-yield for NEET-PG, as it is a frequent site of pathology in spondyloarthropathies. **1. Why S1-2 is Correct:** The articular (auricular) surface of the sacrum is shaped like an inverted "L" or a "C." It typically covers the lateral aspects of the **first and second sacral vertebrae (S1 and S2)**, and occasionally extends slightly into the upper part of S3. This segment is covered by hyaline cartilage on the sacral side and fibrocartilage on the iliac side. This specific location allows the joint to transmit the weight of the upper body from the vertebral column to the bony pelvis. **2. Why the Other Options are Incorrect:** * **Options B and C:** These options suggest that the joint extends down to the lower sacral segments (S4). This is anatomically incorrect. The lower segments of the sacrum (S3-S5) do not participate in the synovial joint; instead, they serve as attachment points for the sacrotuberous and sacrospinous ligaments, which provide extrinsic stability to the pelvic outlet. **3. Clinical Pearls & High-Yield Facts:** * **Joint Type:** It is a **diarthrosis-amphiarthrosis** hybrid. The anterior part is synovial, while the posterior part is a syndesmosis (connected by strong interosseous ligaments). * **Stability:** It is the strongest joint in the body, stabilized primarily by the **posterior sacroiliac ligaments**. * **Clinical Correlation:** In **Ankylosing Spondylitis**, the SI joint is the first to show radiographic changes (sacroiliitis), typically starting at the lower (synovial) portion of the S1-S2 segment. * **Nutations:** The movement at this joint is called nutation (nodding forward) and counter-nutation.

Question 265: Which fascia extends from the rectum to the posterior pelvic wall?

A. Fascia of Waldeyer (Correct Answer)
B. Fascia of Denonvilliers
C. Scarpa's fascia
D. Colles' fascia

Explanation: The correct answer is **A. Fascia of Waldeyer**. ### **Explanation** The **Fascia of Waldeyer** (also known as the **sacrorectal** or **presacral fascia**) is a thick layer of connective tissue that extends from the posterior aspect of the rectum to the sacrum and the posterior pelvic wall. It originates from the presacral parietal fascia at the level of S2–S4 and attaches to the rectal fascia at the anorectal junction. Clinically, it forms the posterior boundary of the retrorectal space, and its surgical division is a critical step in mobilizing the rectum during a Total Mesorectal Excision (TME) [1]. ### **Analysis of Incorrect Options** * **B. Fascia of Denonvilliers (Rectovesical fascia):** This is located **anterior** to the rectum. In males, it separates the rectum from the prostate and seminal vesicles; in females, it is represented by the rectovaginal septum. * **C. Scarpa’s Fascia:** This is the deep, membranous layer of the **superficial fascia of the anterior abdominal wall**. It is continuous with Colles' fascia in the perineum. * **D. Colles’ Fascia:** This is the deep layer of the **superficial perineal fascia**. It forms the floor of the superficial perineal pouch and does not extend to the posterior pelvic wall [2]. ### **High-Yield NEET-PG Pearls** * **Surgical Landmark:** The Fascia of Waldeyer must be incised to access the "holy plane" of rectal surgery to avoid damaging the presacral venous plexus (which causes massive bleeding) [1]. * **Fascia of Denonvilliers:** Important for preventing the spread of rectal cancer anteriorly to the prostate. * **Sibson’s Fascia:** Often confused by name; it is the suprapleural membrane at the thoracic inlet.

Question 266: Which ligament prevents retroversion of the uterus?

A. Round ligament
B. Uterosacral ligament (Correct Answer)
C. Pubocervical ligament
D. Cardinal ligament

Explanation: The uterus is maintained in its normal position of **anteflexion** (forward bending of the body on the cervix) and **anteversion** (forward tilting of the cervix on the vagina) by a complex system of ligaments [2]. ### **Explanation of the Correct Answer** **B. Uterosacral Ligament:** These ligaments extend from the posterolateral aspect of the cervix to the periosteum of the sacrum (S2-S3). Their primary function is to pull the cervix **backwards and upwards**. By keeping the cervix anchored posteriorly, the body of the uterus is naturally tilted forward over the bladder. Therefore, they are the primary structures preventing the uterus from falling backward into the pouch of Douglas (**retroversion**) [1]. ### **Why Other Options are Incorrect** * **A. Round Ligament:** While it helps maintain anteversion by pulling the fundus forward toward the labia majora, it is a weak ligament. It is primarily responsible for maintaining the position *after* it has been established; it does not prevent retroversion as effectively as the uterosacral ligaments. * **C. Pubocervical Ligament:** These extend from the cervix to the posterior surface of the pubic bones [1]. They support the bladder and prevent cystocele but do not play a major role in preventing retroversion. * **D. Cardinal (Mackenrodt’s) Ligament:** These are the **primary supports** of the uterus, preventing **uterine prolapse** (downward displacement) [1]. They provide lateral stability but do not specifically govern the anterior-posterior tilt. ### **NEET-PG High-Yield Pearls** * **Primary Support of Uterus:** Cardinal (Mackenrodt’s) ligaments [1]. * **Dynamic Support:** The Pelvic Diaphragm (Levator ani muscle). * **Structures within the Broad Ligament:** Uterine artery, ureter (at the base), and ovaries (attached via mesovarium). * **Clinical Correlation:** Weakness of the uterosacral ligaments is a key factor in the development of **retroverted uterus** and contributes to **apical prolapse** [1].

Question 267: A 59-year-old woman comes to a local hospital for uterine cancer surgery. As the uterine artery passes from the internal iliac artery to the uterus, it crosses superior to which of the following structures that is sometimes mistakenly ligated during such surgery?

A. Ovarian artery
B. Ovarian ligament
C. Uterine tube
D. Ureter (Correct Answer)

Explanation: The correct answer is **D. Ureter**. This question tests the critical anatomical relationship between the uterine artery and the ureter within the female pelvis [1, 2]. As the uterine artery travels medially from the internal iliac artery toward the uterus, it passes **superior (anterior)** to the ureter [2]. This occurs approximately 1–2 cm lateral to the cervix within the base of the broad ligament (cardinal ligament), where the condensation of tissue around the vaginal vault and cervix (parametrium/Mackenrodt's) also provides a protective sheath for the terminal part of the ureter [3]. **Why the Ureter is the Correct Answer:** The mnemonic **"Water under the bridge"** is high-yield for NEET-PG: the "water" (urine in the ureter) passes "under the bridge" (the uterine artery in females or the vas deferens in males). During a hysterectomy, surgeons must ligate the uterine artery to control bleeding. If the ureter is not carefully identified, it may be mistakenly clamped or ligated due to this close proximity, leading to hydronephrosis or ureterovaginal fistulas. **Why Other Options are Incorrect:** * **A. Ovarian artery:** This arises from the abdominal aorta and travels within the suspensory ligament of the ovary [1]. It does not cross the uterine artery in this manner. * **B. Ovarian ligament:** This connects the ovary to the lateral wall of the uterus; it is located superior to the uterine artery's path. * **C. Uterine tube:** The fallopian tubes are located in the superior margin of the broad ligament, well above the level where the uterine artery crosses the ureter [1]. **Clinical Pearls for NEET-PG:** * **Danger Zones:** The ureter is most vulnerable to injury at three points during pelvic surgery: (1) At the pelvic brim during ligation of the infundibulopelvic ligament, (2) where it is crossed by the uterine artery, and (3) at the vesicoureteric junction. * **Blood Supply:** The uterine artery is a branch of the **anterior division** of the internal iliac artery [2].

Question 268: Which of the following is the artery primarily responsible for the blood supply to the endometrium?

A. Endometrial artery
B. Myometrial artery
C. Spiral artery (Correct Answer)
D. Cervical artery

Explanation: **Explanation:** The blood supply to the uterus follows a specific hierarchical branching pattern. The **Uterine artery** (a branch of the internal iliac artery) enters the myometrium and gives off **Arcuate arteries**, which encircle the uterus [2]. These further branch into **Radial arteries** that penetrate deep into the myometrium. As the radial arteries reach the junction of the myometrium and endometrium, they divide into two types of vessels: 1. **Straight (Basal) arteries:** These supply the *stratum basalis* (the permanent layer) and are not sensitive to hormonal changes [2]. 2. **Spiral arteries:** These supply the **stratum functionalis** (the decidual layer of the endometrium) [2]. These are the primary vessels responsible for nourishing the endometrium and are highly sensitive to progesterone [1]. **Why other options are incorrect:** * **Endometrial and Myometrial arteries:** These are general descriptive terms rather than specific anatomical names for the vessels in the uterine vascular hierarchy. * **Cervical artery:** This is a branch of the uterine artery that specifically supplies the cervix and the upper vagina, not the endometrial lining of the uterine body. **NEET-PG High-Yield Pearls:** * **Menstruation:** The withdrawal of progesterone causes intense vasoconstriction of the **spiral arteries**, leading to ischemia and shedding of the *stratum functionalis*. * **Water under the bridge:** The uterine artery crosses **superior** to the ureter ("water") near the lateral fornix of the vagina, a critical landmark during hysterectomy. * **Spiral artery remodeling:** During pregnancy, trophoblastic invasion converts high-resistance spiral arteries into low-resistance vessels to ensure adequate placental perfusion. Failure of this process is linked to **Pre-eclampsia**.

Question 269: All of the following form the ligamentous extensions of the hypogastric sheath, EXCEPT:

A. Uterosacral ligament
B. Mackenrodt's ligament
C. Lateral true ligaments of bladder
D. Broad ligament (Correct Answer)

Explanation: The **hypogastric sheath** is a condensation of extraperitoneal connective tissue (pelvic fascia) that conveys neurovascular structures from the lateral pelvic wall to the pelvic viscera. It is divided into three laminae (anterior, intermediate, and posterior), which form the "true" supporting ligaments of the pelvic organs [1]. ### Why Broad Ligament is the Correct Answer: The **Broad ligament** is a **peritoneal fold** (double layer of peritoneum) that drapes over the uterus and fallopian tubes [2]. Unlike the hypogastric sheath, it is not a condensation of endopelvic fascia and provides minimal structural support to the uterus. In NEET-PG, it is crucial to distinguish between "true" ligaments (fascial) and "false" ligaments (peritoneal). ### Explanation of Incorrect Options: * **Lateral true ligaments of bladder:** These are formed by the **anterior lamina** of the hypogastric sheath. they support the base of the bladder and carry the superior vesical artery. * **Mackenrodt’s ligament (Lateral Cervical/Cardinal ligament):** Formed by the **intermediate lamina**, it is the primary support of the uterus, attaching the cervix and vaginal fornices to the lateral pelvic wall [1]. * **Uterosacral ligament:** Formed by the **posterior lamina**, these ligaments extend from the cervix to the sacrum, maintaining the uterus in an anteverted position [1]. ### High-Yield Clinical Pearls for NEET-PG: * **Primary Support of Uterus:** Mackenrodt’s (Cardinal) ligament. Its failure leads to uterine prolapse [1]. * **Ureter Relation:** The ureter passes **under** the uterine artery ("water under the bridge") within the base of the Mackenrodt’s ligament [1]. * **Contents of Broad Ligament:** Fallopian tubes, Round ligament, Ovarian ligament, Uterine/Ovarian vessels, and the Epoophoron/Paraoophoron (vestigial remnants) [2].

Question 270: Pain of external hemorrhoids is carried by which nerve?

A. Pudendal nerve (Correct Answer)
B. Perineal nerve
C. Superior rectal nerve
D. Dorsal nerve of penis or clitoris

Explanation: The sensory innervation of the anal canal is divided by the **pectinate (dentate) line**, which serves as a critical landmark for understanding pain localization in hemorrhoids. ### **Explanation of the Correct Answer** **External hemorrhoids** occur below the pectinate line. This area is lined by modified skin (anoderm) which is highly sensitive and receives **somatic sensory innervation**. The primary nerve responsible is the **inferior rectal nerve**, which is a direct branch of the **pudendal nerve (S2–S4)**. Because these fibers are somatic, external hemorrhoids are acutely painful. ### **Why Other Options are Incorrect** * **B. Perineal nerve:** While this is a branch of the pudendal nerve, it primarily supplies the muscles of the urogenital triangle and the skin of the posterior scrotum/labia, not the anal orifice. * **C. Superior rectal nerve:** This is the continuation of the inferior mesenteric artery's plexus. it provides **autonomic (visceral) innervation** to the area *above* the pectinate line. Internal hemorrhoids are supplied by these fibers; since visceral nerves only sense stretch and not pain, internal hemorrhoids are typically painless. * **D. Dorsal nerve of penis/clitoris:** This is a terminal branch of the pudendal nerve that supplies the glans and skin of the penis or clitoris; it has no role in anal sensation. ### **High-Yield Clinical Pearls for NEET-PG** * **The Rule of Pain:** Above Pectinate Line = Autonomic (Painless); Below Pectinate Line = Somatic (Painful). * **Lymphatic Drainage:** Above pectinate line drains to **Internal Iliac nodes**; below drains to **Superficial Inguinal nodes**. * **Embryology:** The upper anal canal is derived from **Endoderm** (Hindgut), while the lower part is from **Ectoderm** (Proctodeum). * **Portosystemic Anastomosis:** Hemorrhoids represent a site of clinical anastomosis between the Superior Rectal Vein (Portal) and Middle/Inferior Rectal Veins (Systemic).

Practice by Chapter

Pelvic Walls and Floor

Practice Questions

Pelvic Viscera

Practice Questions

Urogenital Organs

Practice Questions

Pelvic Vasculature

Practice Questions

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

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free