Pelvis and Perineum Practice Questions

Q: The part of the uterine tube that opens at the superior angle of the uterine cavity is called the?

Ostium. The uterine tube (Fallopian tube) is a muscular tube approximately 10 cm long that connects the peritoneal cavity to the uterine cavity [1]. ### **Explanation of the Correct Answer** The **uterine ostium** (specifically the internal ostium) is the opening of the fallopian tube into the superior angle of the uterine cavity. Anatomically, the fallopian tube is divided into four parts (from lateral to medial): Infundibulum, Ampulla, Isthmus, and the **Intramural (interstitial) part** [2]. The intramural part lies within the wall of the uterus and terminates at the **ostium**, which serves as the anatomical gateway between the tube and the uterine lumen. ### **Why Other Options are Incorrect** * **A. Isthmus:** This is the narrow, thick-walled medial third of the uterine tube located just lateral to the uterus. While it is close to the uterus, it is a *segment* of the tube, not the *opening* itself [2]. * **C. Plexus:** This refers to a network of nerves or vessels (e.g., the pampiniform plexus or uterine venous plexus) and is not a structural component of the uterine tube's lumen. * **D. Fold:** This likely refers to the mucosal folds (plicae) found within the tube, which are most complex in the ampulla to facilitate fertilization, but they do not define the opening into the uterus. ### **High-Yield Clinical Pearls for NEET-PG** * **Widest/Longest Part:** The **Ampulla** is the widest and longest part; it is the most common site for **fertilization** and **ectopic pregnancy** [2]. * **Narrowest Part:** The **Intramural part** is the narrowest segment (0.5–1 mm) [2]. * **Hysterosalpingography (HSG):** This imaging technique is used to check the patency of the ostium and tubes in infertility workups. * **Epithelium:** The tube is lined by **ciliated simple columnar epithelium**, which helps move the ovum toward the ostium.

Q: The sacrotuberous ligament is pierced by which nerve?

Coccygeal Nerve. **Explanation:** The **sacrotuberous ligament** is a massive, fan-shaped ligament that extends from the sacrum, coccyx, and posterior iliac spines to the ischial tuberosity. It plays a crucial role in stabilizing the sacroiliac joint and converting the sciatic notches into the greater and lesser sciatic foramina. **Why the Coccygeal Nerve is Correct:** The coccygeal nerve (the most inferior spinal nerve) and its branches, along with the **perforating cutaneous nerve** (derived from S2 and S3), pierce the sacrotuberous ligament to reach the skin over the lower part of the gluteus maximus and the coccygeal region. This is a classic anatomical landmark frequently tested in postgraduate entrance exams. **Analysis of Incorrect Options:** * **A. S1 Nerve:** The S1 nerve root emerges from the first anterior sacral foramen. It contributes to the sacral plexus and the sciatic nerve, passing anterior to the ligament, not through it. * **B. L5 Nerve:** The L5 nerve root joins the S1 nerve to form the lumbosacral trunk. It descends into the pelvis over the ala of the sacrum and does not interact with the sacrotuberous ligament. * **D. None of the above:** Incorrect, as the coccygeal nerve is the established anatomical answer. **High-Yield NEET-PG Pearls:** * **Structures piercing the ligament:** The coccygeal nerve and the perforating cutaneous nerve. * **Boundaries:** The sacrotuberous ligament forms the posterolateral boundary of the **ischiorectal (ischioanal) fossa**. * **Clinical Correlation:** Tension or calcification of this ligament can lead to **Pudendal Nerve Entrapment** (Alcock’s Canal Syndrome), as the pudendal nerve passes between the sacrotuberous and sacrospinous ligaments.

Q: Which of the following is considered a part of the broad ligament?

Mesovarium. The **broad ligament** is a wide fold of peritoneum that connects the sides of the uterus to the walls and floor of the pelvis [1]. It acts as a "mesentery" for the female reproductive organs and is divided into three distinct anatomical parts. ### **Why Mesovarium is Correct** The broad ligament is composed of three sub-regions: 1. **Mesometrium:** The largest part, surrounding the uterus. 2. **Mesosalpinx:** The portion associated with the fallopian (uterine) tube [1]. 3. **Mesovarium:** The posterior extension that attaches to the hilum of the ovary, carrying the ovarian vessels and nerves [1]. Since the mesovarium is a direct subdivision of the broad ligament, it is the correct answer. ### **Why Other Options are Incorrect** * **B & C (Ovarian and Round Ligaments):** These are **remnants of the gubernaculum**. While they are *enclosed* within the folds of the broad ligament, they are distinct fibrous structures (ligaments) and are not considered parts of the peritoneal fold itself. * **D (Suspensory Ligament of the Ovary):** Also known as the infundibulopelvic ligament, this is a fold of peritoneum that extends upwards from the ovary to the pelvic wall [1]. It is continuous with the broad ligament but is generally classified as a separate functional entity containing the ovarian artery and vein. ### **High-Yield NEET-PG Pearls** * **Contents of Broad Ligament:** Uterine tube, Round ligament, Ovarian ligament, Uterine & Ovarian arteries, Ureter (at the base), and vestigial remnants (Epoophoron and Paraoophoron) [1]. * **The Ureter:** It passes **inferior** to the uterine artery ("Water under the bridge") within the base of the broad ligament (cardinal ligament area) [2]. * **Gubernaculum Remnants:** In females, the gubernaculum becomes the **Ovarian ligament** (proximal) and the **Round ligament** (distal).

Q: Pubic symphysis is which type of joint?

Cartilaginous. The **pubic symphysis** is a midline **Secondary Cartilaginous joint** (also known as a **Symphysis**). **1. Why the correct answer is right:** Secondary cartilaginous joints are characterized by the articular surfaces of the bones being covered by a thin layer of hyaline cartilage, which are then connected by a strong disc of **fibrocartilage**. These joints are designed for strength and limited shock absorption. They are always located in the median plane of the body (e.g., intervertebral discs, manubriosternal joint). **2. Why incorrect options are wrong:** * **Synovial (A):** These joints possess a fluid-filled joint cavity and allow for free movement (e.g., hip or knee). The pubic symphysis lacks a synovial membrane and has very restricted mobility. Synovial membranes are lined by synoviocytes and provide lubrication for articular hyaline cartilage [1]. * **Fibrous (B):** In these joints, bones are joined by dense connective tissue with no cartilage involved (e.g., sutures of the skull or gomphosis). While the pubic symphysis has fibrous components, the presence of the fibrocartilaginous disc classifies it as cartilaginous. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Relaxin Hormone:** During pregnancy, the hormone relaxin causes the ligaments and the fibrocartilage of the pubic symphysis to soften and become more pliable. This increases the diameters of the pelvic outlet to facilitate childbirth. * **Movement:** Although generally classified as amphiarthrosis (slightly movable), the only significant movement occurs during the late stages of pregnancy and labor. * **Histology:** Unlike primary cartilaginous joints (synchondroses), secondary cartilaginous joints **do not ossify** with age (except for the xiphisternal joint). Hyaline cartilage in these joints is a unique tissue composed of water, type II collagen, and proteoglycans [1].

Q: Which of the following is the largest and most important muscle in the pelvic floor?

Levator ani. The pelvic floor (pelvic diaphragm) is a funnel-shaped musculofascial layer that closes the pelvic outlet and supports the pelvic viscera. ### **Why Levator Ani is the Correct Answer** The **Levator ani** is the largest and most critical component of the pelvic floor [1]. It consists of three parts: the **puborectalis, pubococcygeus, and iliococcygeus** [3]. It is considered the most important muscle because it maintains intra-abdominal pressure and provides constant tonic support to the pelvic organs (uterus, bladder, and rectum) [1]. Its "U-shaped" puborectalis sling is vital for maintaining fecal continence by creating the anorectal angle [3]. ### **Explanation of Incorrect Options** * **A. Coccygeus:** While it forms the posterior part of the pelvic diaphragm, it is much smaller than the levator ani and is often partly tendinous. Its primary role is pulling the coccyx forward after defecation. * **B. External anal sphincter:** This is a voluntary muscle of the **perineum**, not the pelvic floor [2]. It surrounds the anal canal to control defecation but does not provide structural support to the pelvic viscera. * **C. Obturator internus:** This is a muscle of the **lateral pelvic wall** (and gluteal region). It originates within the pelvis but functions as a lateral rotator of the thigh at the hip joint. ### **High-Yield Clinical Pearls for NEET-PG** * **Nerve Supply:** The levator ani is supplied by the **perineal branch of S4** and the **inferior rectal nerve** (from the pudendal nerve, S2-S4). * **Clinical Significance:** Injury to the levator ani (specifically the pubococcygeus) during childbirth is the leading cause of **stress urinary incontinence** and **pelvic organ prolapse**. * **The Tendinous Arch:** The levator ani originates from a thickened line of the obturator fascia known as the **tendinous arch of the levator ani (ATLA)**.

Q: What is the primary blood supply to the bulb of the penis?

Bulbourethral artery. The primary blood supply to the bulb of the penis is the **Bulbourethral artery** (also known as the **Artery to the Bulb**). ### **Explanation of the Correct Answer** The **Internal Pudendal Artery**, a branch of the internal iliac artery, is the main artery of the perineum. As it travels through the deep perineal pouch, it gives off several branches to the penis. The **Bulbourethral artery** is a short, thick branch that pierces the perineal membrane to enter and supply the **bulb of the penis** and the **bulbourethral glands (Cowper’s glands)**. It provides the necessary vascularity for the corpus spongiosum at its proximal expansion. ### **Analysis of Incorrect Options** * **A. Scrotal artery:** These are branches of the internal and external pudendal arteries that supply the skin and layers of the scrotum, not the erectile tissues of the penis. * **B. Superficial pudendal artery:** A branch of the femoral artery that supplies the skin of the lower abdomen and the external genitalia (skin and fascia), but does not reach the deep structures like the bulb. * **C. Bulbocavernosus artery:** This is a distractor term. While the *bulbospongiosus* (bulbocavernosus) muscle covers the bulb, the artery supplying the bulb itself is the bulbourethral artery. ### **High-Yield NEET-PG Pearls** * **Branches of Internal Pudendal Artery (in order):** Inferior rectal, Perineal, Artery to the bulb, Urethral artery, Deep artery of the penis (supplies corpora cavernosa; responsible for erection), and Dorsal artery of the penis. * **Venous Drainage:** The deep dorsal vein of the penis drains into the **prostatic venous plexus**, which is a common route for the spread of pelvic infections or malignancies. * **Clinical Correlation:** Trauma to the perineum (straddle injury) can rupture the bulbourethral artery, leading to a hematoma confined within the superficial perineal pouch (Colles' fascia).

Question 1

The part of the uterine tube that opens at the superior angle of the uterine cavity is called the?

Accepted Answer

Ostium

Answer

Isthmus

Answer

Plexus

Answer

Fold

Question 2

The sacrotuberous ligament is pierced by which nerve?

Accepted Answer

Coccygeal Nerve

Answer

S1 Nerve

Answer

L5 Nerve

Answer

None of the above

Question 3

What is the immediate common posterior relation for the body of the uterus and the supravaginal portion of the cervix?

Accepted Answer

Coils of ileum and sigmoid colon

Answer

Rectum

Answer

Pineal body

Answer

Sacrum

Question 4

Which of the following is considered a part of the broad ligament?

Accepted Answer

Mesovarium

Answer

Ovarian ligament

Answer

Round ligament of the uterus

Answer

Suspensory ligament of the ovary

Question 5

A 37-year-old small business manager receives a gunshot wound in the pelvic cavity, resulting in a lesion of the sacral splanchnic nerves. Which of the following nerve fibers would primarily be damaged?

Accepted Answer

Preganglionic sympathetic fibers

Answer

Postganglionic parasympathetic fibers

Answer

Postganglionic sympathetic fibers

Answer

Preganglionic parasympathetic fibers

Question 6

Which of the following structures does not conduct spermatozoa?

Accepted Answer

Duct of the seminal vesicle

Answer

Ampulla of the ductus deferens

Answer

Epididymis

Answer

Prostatic urethra

Question 7

Pubic symphysis is which type of joint?

Accepted Answer

Cartilaginous

Answer

Synovial

Answer

Fibrous

Answer

None of the above

Question 8

Which of the following is the largest and most important muscle in the pelvic floor?

Accepted Answer

Levator ani

Answer

Coccygeus

Answer

External anal sphincter

Answer

Obturator internus

Question 9

A bicyclist suddenly applies the brake and lands on his perineum on the crossbar of the bicycle. While attempting to urinate, he develops marked swelling of the scrotum. The structure most probably injured is?

Accepted Answer

Spongy urethra

Answer

Bladder

Answer

Prostatic urethra

Answer

Membranous urethra

Question 10

What is the primary blood supply to the bulb of the penis?

Accepted Answer

Bulbourethral artery

Answer

Scrotal artery

Answer

Superficial pudendal artery

Answer

Bulbocavernosus artery

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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