Pelvis and Perineum Practice Questions

Q: Which one of the following is NOT a support of uterus, preventing its descent?

Inguinal ligament. ***Inguinal ligament*** - The **inguinal ligament** is a fibrous band extending from the **anterior superior iliac spine** to the **pubic tubercle**, forming the inferior border of the anterior abdominal wall [2]. - It plays no direct role in supporting the uterus; its primary function is to serve as an attachment site for muscles and define the **inguinal canal** [2]. *Endopelvic fascia* - The **endopelvic fascia** is a connective tissue layer that surrounds pelvic organs and contributes significantly to their support [1]. - It forms condensations such as the **uterosacral** and **cardinal (Mackenrodt's) ligaments**, which directly stabilize the uterus [1]. *Mackenrodt's ligament* - Also known as the **cardinal ligament** or **transverse cervical ligament**, it extends from the cervix and lateral vaginal fornix to the lateral pelvic walls [1]. - This ligament is a primary support of the uterus, preventing its descent and maintaining its position [1]. *Pubocervical ligament* - The **pubocervical ligament** extends from the anterior aspect of the cervix to the posterior surface of the pubic symphysis. - It is a condensation of the **endopelvic fascia** and provides anterior support to the uterus and bladder [1].

Q: What is the volume of the prostate in normal adult males?

20cc. ***20cc*** - The normal prostate volume in adult males is typically **20 cubic centimeters (cc)** or grams, which is approximately the size of a walnut. - This volume is generally used as a baseline when assessing for conditions like **benign prostatic hyperplasia (BPH)** or prostate cancer, where an enlarged prostate is a key indicator [1]. *50cc* - A prostate volume of 50cc is considered **enlarged** and is often indicative of **benign prostatic hyperplasia (BPH)**, especially in older men [1]. - This volume would lead to symptoms of **lower urinary tract symptoms (LUTS)**, such as frequent urination or difficulty voiding, which are not characteristic of a normal prostate [1]. *75cc* - A prostate volume of 75cc represents a **significantly enlarged prostate**, well beyond the normal range. - Such a size would almost certainly be associated with **moderate to severe LUTS** and likely require medical intervention for BPH. *100cc* - A 100cc prostate is considered a **markedly enlarged prostate**, typically resulting in severe **urinary obstruction** and significant impact on quality of life. - This volume is far from normal and would usually necessitate treatment for **benign prostatic hyperplasia (BPH)**.

Q: What can cause the absence of fructose in seminal fluid?

Both of the above. ***Both of the above*** - **Fructose** in seminal fluid is primarily produced by the **seminal vesicles**, providing energy for sperm motility. - Therefore, either a **congenital absence of seminal vesicles** or an **ejaculatory duct obstruction** (preventing seminal vesicle secretions from reaching the ejaculate) would lead to the absence of fructose. *Congenital absence of seminal vesicle* - The **seminal vesicles** are the primary source of fructose in seminal fluid. - If a person is born without these glands, **fructose will be absent** from their seminal fluid. *Ejaculatory duct obstruction* - An obstruction in the **ejaculatory ducts** would block the passage of secretions from the **seminal vesicles** and vasoepididymis into the urethra. - This prevents **fructose** (from the seminal vesicles) and sperm (from the testes/epididymis) from being present in the ejaculate. *None of the above* - This option is incorrect because both **congenital absence of seminal vesicles** and **ejaculatory duct obstruction** are valid causes for the absence of fructose in seminal fluid.

Q: Identify the pelvic diaphragm in the picture given below:

1. ***1*** - Label 1 points to the **levator ani muscle**, which is the primary component of the **pelvic diaphragm**. - The pelvic diaphragm consists of the levator ani and coccygeus muscles, forming the floor of the pelvic cavity. *2* - Label 2 points to the **external anal sphincter**, a voluntary muscle that surrounds the anal canal. - This muscle is superficial to the pelvic diaphragm and is responsible for maintaining fecal continence. *3* - Label 3 points to the **internal anal sphincter**, an involuntary smooth muscle layer intrinsic to the anal canal. - It maintains resting anal tone and is deep to the external anal sphincter. *4* - Label 4 points to the **ischiorectal fossa**, a fat-filled space located on either side of the anal canal. - This space contains vessels and nerves, but it is not part of the muscular pelvic diaphragm.

Q: A 33-year-old woman comes to the emergency department because of a 1-hour history of severe pelvic pain and nausea. She was diagnosed with a follicular cyst in the left ovary 3 months ago. The cyst was found incidentally during a fertility evaluation. A pelvic ultrasound with Doppler flow shows an enlarged, edematous left ovary with no blood flow. Laparoscopic evaluation shows necrosis of the left ovary, and a left oophorectomy is performed. During the procedure, blunt dissection of the left infundibulopelvic ligament is performed. Which of the following structures is most at risk of injury during this step of the surgery?

Ureter. ***Ureter*** - The **infundibulopelvic ligament** (also known as the suspensory ligament of the ovary) contains the **ovarian artery and vein** and is in close proximity to the ureter as it crosses the pelvic brim. - During dissection or clamping of this ligament, especially in an emergency setting or when anatomy is distorted (e.g., by an enlarged ovary or edema), the **ureter** is highly susceptible to injury. *Bladder trigone* - The **bladder trigone** is the smooth triangular region at the base of the bladder, formed by the openings of the ureters and the internal urethral orifice. - It is not directly adjacent to the infundibulopelvic ligament and is therefore at a comparably lower risk of injury during dissection of this ligament. *Uterine artery* - The **uterine artery** travels within the cardinal ligament and supplies the uterus; it is located more medially and inferiorly within the broad ligament. - While important in pelvic surgery, it is not in the immediate vicinity of the infundibulopelvic ligament dissection itself. *Kidney* - The **kidneys** are retroperitoneal organs located much higher in the abdominal cavity, far superior to the pelvis. - They are not at risk of direct injury during pelvic surgery involving the infundibulopelvic ligament.

Q: A 13-year-old boy is brought to the emergency department by his parents for evaluation of severe groin pain for the past 4 hours. His symptoms began while he was participating in a basketball game. On arrival to the ED, the resident on call notes a swollen, tender, and elevated left testicle with absence of the cremasteric reflex. A urology consult is requested and the patient is scheduled for surgery. An abnormality in which of the following anatomical structures is most likely responsible for this patient’s condition?

Tunica vaginalis. ***Tunica vaginalis*** - This patient presents with symptoms highly suggestive of **testicular torsion**, characterized by acute scrotal pain, testicular elevation, and absence of the cremasteric reflex. - In most cases of testicular torsion, the *tunica vaginalis* has an abnormally high attachment, which allows the testis to rotate freely within the scrotum (bell-clapper deformity). *Cremasteric muscle* - The cremasteric muscle is responsible for elevating the testis; its absence of reflex is a *symptom* of torsion, not the underlying cause of the anatomical predisposition. - While its function is important for testicular positioning, an abnormality in the muscle itself is not the primary anatomical defect leading to torsion. *Tunica dartos* - The tunica dartos is a layer of smooth muscle beneath the scrotal skin that helps regulate testicular temperature by contracting and relaxing the scrotal skin. - Abnormalities in the tunica dartos do not predispose to testicular torsion. *Tunica albuginea* - The tunica albuginea is a dense, fibrous capsule directly surrounding the testis, providing its structural integrity. - While it encases the testis, its abnormal attachment is not the main reason for the increased mobility that leads to torsion; rather, it is the relationship of the *tunica vaginalis* to the testis.

Q: Injury to which of the following muscles that forms the deep support of the perineal body causes cystocele, enterocele and urethral descent?

Pubococcygeus. ***Pubococcygeus*** - The **pubococcygeus muscle** is a major component of the **levator ani muscle** group, forming the primary support structure of the pelvic floor [1]. Damage to this muscle impairs the support for the bladder, rectum, and uterus, leading to prolapse conditions like **cystocele**, **enterocele**, and **urethral descent**. - Its integrity is crucial for maintaining the position of pelvic organs and proper function of the urinary and defecatory systems, as it directly supports the vagina, rectum, and bladder neck [3]. *Sphincter of urethra and anus* - The **external urethral sphincter** primarily controls voluntary urination, and its injury mainly leads to **stress urinary incontinence**, not necessarily prolapse [2]. - The **external anal sphincter** controls defecation, and its injury would primarily lead to **fecal incontinence**, not cystocele, enterocele, or urethral descent [2]. *Bulbospongiosus* - The **bulbospongiosus muscle** is superficial, supporting the clitoris and compressing erectile tissue in females, and expelling semen/urine in males. - Its injury would primarily affect sexual function and perineal body integrity but is **not a primary cause of pelvic organ prolapse** like cystocele or enterocele [3]. *Ischiocavernosus* - The **ischiocavernosus muscle** is also superficial, maintaining erection of the clitoris/penis by compressing the crura. - Injury to this muscle would mainly disrupt **erectile function** and contribute minimally to pelvic organ support or prolapse.

Q: The length of the female urethra is :

40 mm. ***40 mm*** - The typical length of the **female urethra** is approximately **40 mm** (or 4 cm). - This relatively short length is a key reason why females are more susceptible to **urinary tract infections** compared to males. *20 mm* - **20 mm** (2 cm) is significantly shorter than the average female urethral length. - Such a short urethra would drastically increase the risk of **ascending infections** into the bladder. *60 mm* - **60 mm** (6 cm) is longer than the typical female urethra. - A urethra of this length would be more comparable to conditions in males or specific anatomical variations, not the average female. *45 mm* - While closer to the correct answer, **45 mm** is still slightly longer than the generally accepted average length for the female urethra. - The textbook average is usually cited as **4 cm** or 40 mm.

Q: Vaginal sphincter is formed by all except

Internal urethral sphincter. ***Internal urethral sphincter*** - The **internal urethral sphincter** is an involuntary smooth muscle sphincter located at the **bladder neck** [2] - It is responsible for maintaining urinary continence and is NOT involved in forming the vaginal sphincter [2] - This structure is entirely separate from the vaginal musculature *Deep transverse perinei* - The **deep transverse perinei** is a muscle of the urogenital diaphragm that provides structural support to the perineum [1] - It contributes to the muscular framework surrounding and supporting the vagina - Works in conjunction with other perineal muscles to provide vaginal support *Bulbospongiosus* - The **bulbospongiosus muscle** is a superficial perineal muscle that directly surrounds the vaginal orifice - It functions to constrict the vaginal opening and is a primary component of the vaginal sphincter mechanism - Also aids in clitoral erection during sexual arousal *Pubovaginalis* - The **pubovaginalis muscle** is part of the levator ani complex (specifically the pubococcygeus portion) - It loops around and directly supports the vagina, functioning as a key component of the vaginal sphincter - Helps maintain vaginal position and provides voluntary constriction

Q: Which of the following is present in males but not in females?

Bulbourethral gland. ***Bulbourethral gland*** - Also known as **Cowper's glands**, these are exocrine glands found **exclusively in males**, with no homologous structure in females. - They are located inferior to the prostate gland within the deep perineal pouch, secreting pre-ejaculate fluid into the spongy urethra. - Females have Bartholin's glands (greater vestibular glands), which are functionally analogous but anatomically distinct structures. *Bulbospongiosus muscle* - This muscle is present in **both males and females**, though it has different functions. - In males, it covers the bulb of the penis and aids in penile erection and ejaculation. - In females, it covers the vestibular bulbs and supports the clitoris and vagina. *Membranous urethra* - While the male urethra is anatomically divided into prostatic, membranous, and spongy segments, the female urethra also passes through the urogenital diaphragm (perineal membrane), which some anatomists refer to as a "membranous" portion. - The key distinction is that the bulbourethral glands are **exclusively male structures** with no female equivalent, making them the most definitive answer. *Corpus cavernosum* - **Both males and females** possess homologous erectile tissue. - In males, paired corpora cavernosa form the bulk of the penile shaft. - In females, homologous erectile tissue forms the body of the clitoris.

Question 1

Which one of the following is NOT a support of uterus, preventing its descent?

Accepted Answer

Inguinal ligament

Answer

Endopelvic fascia

Answer

Mackenrodt's ligament

Answer

Pubocervical ligament

Question 2

What is the volume of the prostate in normal adult males?

Accepted Answer

20cc

Answer

50cc

Answer

75cc

Answer

100cc

Question 3

What can cause the absence of fructose in seminal fluid?

Accepted Answer

Both of the above

Answer

None of the above

Answer

Congenital absence of seminal vesicle

Answer

Ejaculatory duct obstruction

Question 4

Identify the pelvic diaphragm in the picture given below:

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 5

A 33-year-old woman comes to the emergency department because of a 1-hour history of severe pelvic pain and nausea. She was diagnosed with a follicular cyst in the left ovary 3 months ago. The cyst was found incidentally during a fertility evaluation. A pelvic ultrasound with Doppler flow shows an enlarged, edematous left ovary with no blood flow. Laparoscopic evaluation shows necrosis of the left ovary, and a left oophorectomy is performed. During the procedure, blunt dissection of the left infundibulopelvic ligament is performed. Which of the following structures is most at risk of injury during this step of the surgery?

Accepted Answer

Ureter

Answer

Bladder trigone

Answer

Uterine artery

Answer

Kidney

Question 6

A 13-year-old boy is brought to the emergency department by his parents for evaluation of severe groin pain for the past 4 hours. His symptoms began while he was participating in a basketball game. On arrival to the ED, the resident on call notes a swollen, tender, and elevated left testicle with absence of the cremasteric reflex. A urology consult is requested and the patient is scheduled for surgery. An abnormality in which of the following anatomical structures is most likely responsible for this patient’s condition?

Accepted Answer

Tunica vaginalis

Answer

Cremasteric muscle

Answer

Tunica dartos

Answer

Tunica vasculosa

Answer

Tunica albuginea

Question 7

Injury to which of the following muscles that forms the deep support of the perineal body causes cystocele, enterocele and urethral descent?

Accepted Answer

Pubococcygeus

Answer

Sphincter of urethra and anus

Answer

Bulbospongiosus

Answer

Ischiocavernosus

Question 8

The length of the female urethra is :

Accepted Answer

40 mm

Answer

20 mm

Answer

60 mm

Answer

45 mm

Question 9

Vaginal sphincter is formed by all except

Accepted Answer

Internal urethral sphincter

Answer

Deep transverse perinei

Answer

Bulbospongiosus

Answer

Pubovaginalis

Question 10

Which of the following is present in males but not in females?

Accepted Answer

Bulbourethral gland

Answer

Bulbospongiosus muscle

Answer

Membranous urethra

Answer

Corpus cavernosum

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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