Pelvis and Perineum — MCQs

Pelvis and Perineum Indian Medical PG Practice Questions and MCQs

Question 541: The most important structure preventing uterine prolapse is:

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

Explanation: ***Cardinal ligament*** - The **cardinal ligaments** (also known as transverse cervical ligaments) are crucial for supporting the uterus and preventing **uterine prolapse** by anchoring the cervix and upper vagina laterally to the pelvic sidewalls [1]. - They provide significant **suspension and stability** to the uterus due to their strong fibrous and muscular composition [1]. *Uterosacral ligament* - These ligaments attach the posterior cervix to the sacrum, primarily preventing **retroversion** of the uterus and providing posterior support [1]. - While they contribute to uterine support, their role in preventing descent is secondary to the cardinal ligaments [1]. *Broad ligament* - The **broad ligament** is a wide fold of peritoneum that drapes over the uterus, fallopian tubes, and ovaries, providing a suspensory role rather than strong structural support [1]. - It contains blood vessels and nerves but offers minimal support against **uterine prolapse** itself. *Round ligament* - The **round ligaments** extend from the uterine horns, through the inguinal canal, and insert into the labia majora, primarily helping to maintain the **anteverted and antiflexed position** of the uterus [2]. - They do not play a significant role in preventing the downward descent or **prolapse** of the uterus.

Question 542: Bartholin's duct opens into the:

A. Urethra
B. Vestibule at the posterolateral margins of the vaginal orifice (Correct Answer)
C. Lower and posterior fornix of vagina
D. Upper part of vagina

Explanation: ***Vestibule at the posterolateral margins of the vaginal orifice*** - The **Bartholin's glands** are located on each side of the vaginal opening, and their ducts open into the **vestibule** [1]. - These glands produce **mucus** that lubricate the vagina, especially during sexual arousal [1]. *Urethra* - The **urethra** is responsible for expelling urine from the bladder and is distinct from the reproductive structures. - It is located anterior to the vaginal opening, and its opening is called the **external urethral orifice** [1]. *Lower and posterior fornix of vagina* - The **vaginal fornices** are recesses at the top of the vagina, surrounding the cervix [2]. - They are not the usual drainage sites for accessory glands like Bartholin's. *Upper part of vagina* - The **upper part of the vagina** is closer to the cervix and uterus. - Bartholin's glands are situated in the **lower external genital area** and primarily lubricate the entrance to the vagina [1].

Question 543: Episiotomy incision was extended posteriorly beyond perineal body injuring the structure immediately posterior to it. Which structure has been injured?

A. External anal sphincter (Correct Answer)
B. Ischiocavernosus
C. Urethral sphincter
D. Bulbospongiosus

Explanation: ***External anal sphincter*** - An overextended **episiotomy incision** that goes beyond the perineal body posteriorly will likely injure the **external anal sphincter**, which is immediately posterior to the perineal body [4]. - Injury to this sphincter can lead to **fecal incontinence** [1]. *Ischiocavernosus* - The **ischiocavernosus muscle** is located more laterally in the perineum and plays a role in clitoral erection, not directly posterior to the perineal body. - An episiotomy extending posteriorly would not typically involve this muscle. *Urethral sphincter* - The **urethral sphincter** is located anterior to the perineal body and surrounds the urethra [3]. - Injury to this sphincter is associated with anterior perineal trauma, not posterior extension of an episiotomy [3]. *Bulbospongiosus* - The **bulbospongiosus muscle** is a superficial perineal muscle that surrounds the vaginal orifice and contributes to the perineal body [4]. - While it can be involved in an episiotomy, the structure immediately posterior to the perineal body itself is the external anal sphincter [2].

Question 544: Inflammatory lesions in all of the following areas make the superficial inguinal lymph nodes enlarged and tender, EXCEPT:

A. Spongy Urethra
B. Big Toe
C. Lower part of Anal Canal
D. Isthmus of Uterine Tube (Correct Answer)

Explanation: No changes were made to the original explanation because the provided references did not contain relevant information regarding the lymphatic drainage of the isthmus of the uterine tube, the spongy urethra, the lower limb (big toe), or the anal canal below the pectinate line. Each reference was evaluated and found to be unrelated to the specific anatomical question asked.

Question 545: Which of the following is true regarding levator ani EXCEPT?

A. Supports pelvic viscera
B. Levator ani muscle is attached at pelvic brim (Correct Answer)
C. Pubococcygeus and iliococcygeus are components
D. Fibres are directed posterior and medial

Explanation: ***Levator ani muscle is attached at pelvic brim*** - The **levator ani muscle** is a broad, thin muscle forming the floor of the **pelvic cavity** and is not attached at the **pelvic brim** [1]. - Its attachments are primarily to the **pubis**, **ischial spines**, and the **tendinous arch of the obturator fascia** [1]. *Supports pelvic viscera* - The **levator ani** forms a significant part of the **pelvic diaphragm**, which acts as a muscular sling to support the **pelvic organs** such as the bladder, uterus (in females), and rectum [1]. - This support is crucial in preventing **pelvic organ prolapse**. *Pubococcygeus and iliococcygeus are components* - The **levator ani** is composed of several muscles, prominently including the **pubococcygeus**, **iliococcygeus**, and **puborectalis** [2]. These muscles work together to provide form and function to the pelvic floor. - The **pubococcygeus** originates from the pubis, and the **iliococcygeus** originates from the tendinous arch and ischial spine [2]. *Fibres are directed posterior and medial* - The muscle fibers of the **levator ani** generally run from their anterior and lateral attachments (pubis, ischial spines, tendinous arch) downwards, medially, and posteriorly. - They insert into the **anococcygeal raphe** and the sides of the **coccyx**, creating a gutter-like structure that supports the pelvic contents [2].

Question 546: At which vertebral level is the ischial spine located?

A. L4
B. S2 (Correct Answer)
C. S3-S5
D. Coccygeal region

Explanation: ***S2*** - The **ischial spine** is a bony projection located on the posterior border of the ischium [1]. - It is anatomically located at the vertebral level of **S2**, which is a crucial landmark especially in obstetrics for assessing the station of the fetal head during labor [1]. *L4* - The **L4 vertebral level** is generally associated with the **iliac crests** and is a common site for lumbar punctures. - It lies significantly superior to the ischial spine and is not a relevant landmark for its location. *S3-S5* - The vertebral levels **S3 to S5** primarily contribute to the formation of the lower sacrum and the coccyx. - While they are inferior to S2, they are not directly associated with the precise anatomical level of the ischial spine. *Coccygeal region* - The **coccygeal region** consists of the fused coccygeal vertebrae, forming the tailbone. - This region is located inferior to the sacrum and is distinct from the level of the ischial spine, which is situated higher on the pelvis.

Question 547: A cyst near the testis is most likely a problem with which structure?

A. Seminal vesicle
B. Prostate
C. Epididymis (Correct Answer)
D. Urethra

Explanation: ***Epididymis*** - Cysts near the testis are most commonly **spermatoceles or epididymal cysts**, which originate from the **epididymis**. - These cysts are typically benign and contain fluid, sometimes mixed with sperm. *Seminal vesicle* - The **seminal vesicles** are located posterior to the bladder and do not typically form cysts directly adjacent to the testis. - Cysts in this area are rare and usually associated with congenital anomalies. *Prostate* - The **prostate gland** is located inferior to the bladder and surrounds the urethra, far from the testis. - Prostatic cysts are distinct entities and are not typically found near the testis. *Urethra* - The **urethra** is the tube that carries urine and semen out of the body, and it passes through the penis. - Urethral cysts are uncommon and do not present as a cyst near the testis.

Question 548: A patient with a pelvic fracture is at risk of injuring which major vessel that supplies the pelvic organs?

A. Common iliac artery
B. Internal iliac artery (Correct Answer)
C. Femoral artery
D. External iliac artery

Explanation: ***Internal iliac artery*** - The **internal iliac artery** runs along the **lateral pelvic wall** and supplies blood to the pelvic organs, including the bladder, uterus, rectum, and pelvic muscles. [1], [2] - Due to its anatomical position deep within the pelvis in close proximity to the bony structures, it is particularly vulnerable to injury from the sharp edges of a **pelvic fracture**. [1] - Branches of the internal iliac (especially superior gluteal, inferior gluteal, and obturator arteries) are the most commonly injured vessels in pelvic fractures. [1] *Common iliac artery* - The **common iliac artery** bifurcates into the internal and external iliac arteries at the **pelvic brim** (around L5-S1 level) [1]. - It is located higher and more protected from direct pelvic fracture injury due to its superior position above the true pelvis. *Femoral artery* - The **femoral artery** is a continuation of the external iliac artery once it passes beneath the **inguinal ligament**, located in the thigh. [2] - While significant pelvic trauma could indirectly affect blood flow, it is not located within the pelvis and is not directly injured by pelvic fractures. *External iliac artery* - The **external iliac artery** primarily supplies the lower limb and runs along the **medial border of the psoas muscle**. [2] - While it traverses the pelvis, it is more anterior and runs closer to the pelvic brim, making it less vulnerable to typical pelvic fracture fragments compared to the internal iliac artery and its branches.

Question 549: A 10-year-old boy presents with a painless swelling in his scrotum. Examination reveals a hydrocele. Which structure is most likely involved?

A. Testis
B. Epididymis
C. Tunica vaginalis (Correct Answer)
D. Spermatic cord

Explanation: ***Tunica vaginalis*** - A hydrocele is an accumulation of serous fluid within the **tunica vaginalis,** the peritoneal sac that surrounds the testis. - In a 10-year-old boy, this is often a **communicating hydrocele** due to a patent **processus vaginalis**, allowing peritoneal fluid to enter the scrotum. *Testis* - While the testis is located within the scrotum, a hydrocele specifically refers to fluid *around* the testis, not within its substance. - Swelling *of* the testis itself, especially if painful, would more likely suggest conditions like **orchitis** or a **testicular tumor**. *Epididymis* - The epididymis is a coiled tube located on the posterior aspect of the testis, involved in sperm maturation and storage. - Conditions affecting the epididymis, such as **epididymitis**, involve inflammation of this structure, not fluid accumulation in the tunica vaginalis. *Spermatic cord* - The spermatic cord contains structures leading to and from the testis, including the vas deferens, blood vessels, and nerves. - Pathology in the spermatic cord region might present as a **varicocele** (dilated pampiniform plexus veins), which is distinct from a hydrocele. - A **spermatocele** (cystic collection at the epididymis head) and **hydrocele of the cord** (encysted hydrocele) are other differential diagnoses, but neither involves the spermatic cord itself.

Question 550: Which of the following statements about the hymen in the context of child anatomy is correct?

A. The hymen's position does not affect its likelihood of tearing.
B. The hymen is elastic and can stretch without tearing easily.
C. The hymen is a thin membrane that can tear easily. (Correct Answer)
D. The hymen is located deep within the vaginal canal, making it less likely to tear easily.

Explanation: ***The hymen is a thin membrane that can tear easily*** - This statement is correct as the hymen is typically a **thin, delicate membrane** located at the vaginal introitus (opening). - Its thinness and delicate nature make it **susceptible to tearing** from various activities, including physical activity, tampon use, medical examination, and sexual intercourse. - The hymenal tissue is composed of **mucous membrane** with minimal connective tissue support, contributing to its fragility. *The hymen's position does not affect its likelihood of tearing* - The **anatomical position** and **configuration** of the hymen significantly influence the likelihood of tearing. - A hymen located at the **vaginal introitus** (superficial position) is more vulnerable to mechanical trauma compared to deeper structures. - Hymenal configuration (annular, crescentic, septate, etc.) also affects susceptibility to injury. *The hymen is elastic and can stretch without tearing easily* - While the hymen can demonstrate some **individual variation** in elasticity, its primary characteristic is its **delicate fragility**. - Most hymens have **limited elastic capacity** and are prone to tears rather than significant stretching. - The degree of elasticity varies among individuals, but fragility is the predominant feature in most cases. *The hymen is located deep within the vaginal canal, making it less likely to tear easily* - The hymen is located at or near the **vaginal introitus (external opening)**, not deep within the vaginal canal. - Its **superficial anatomical position** makes it readily accessible and thus more **vulnerable to mechanical trauma**. - The hymen marks the junction between the external genitalia and the vaginal canal.

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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