Pelvis and Perineum Practice Questions

Q: All of the following are branches of the uterine artery except?

Obturator artery. The **uterine artery** is a major branch of the **internal iliac artery** (anterior division). It provides the primary blood supply to the uterus and undergoes significant hypertrophy during pregnancy [1]. **Why Obturator Artery is the Correct Answer:** The **Obturator artery** is a separate branch of the anterior division of the internal iliac artery. While it runs close to the pelvic wall, it does not originate from the uterine artery. It primarily supplies the medial compartment of the thigh. **Analysis of Incorrect Options:** The uterine artery enters the broad ligament and follows a tortuous course along the lateral border of the uterus, giving off several intramural branches in a specific sequence [1]: * **Radial Artery (B):** These branches penetrate deep into the myometrium from the arcuate arteries (which are direct divisions of the uterine artery). * **Spiral Artery (A):** These are the terminal branches of the radial arteries that supply the *stratum functionalis* of the endometrium [1]. They are physiologically significant as they undergo vasoconstriction and shedding during menstruation. * **Sampson Artery (C):** This is a specific branch of the uterine artery that runs under the **round ligament** of the uterus. It provides an anastomosis between the uterine and ovarian arteries. **NEET-PG High-Yield Pearls:** * **Water under the bridge:** The uterine artery crosses **superior** to the ureter ("Water" = Ureter, "Bridge" = Uterine Artery) near the cervix. This is a critical landmark during a hysterectomy to avoid ureteric injury. * **Sampson’s Artery** is a classic "distractor" or "niche" fact; remember it is the artery of the round ligament. * The uterine artery also provides a **vaginal branch** and an **ovarian branch** that anastomoses with the ovarian artery (a direct branch of the Abdominal Aorta) [1].

Q: The pectinate line is an important anatomical landmark because it signifies a division in which of the following aspects?

All of the above. The **pectinate (dentate) line** is the most critical landmark in the anatomy of the anal canal because it represents the site of fusion between the **ectoderm** (proctodeum) and the **endoderm** (hindgut) [1]. This embryological junction results in distinct anatomical differences above and below the line. ### Why "All of the Above" is Correct: The pectinate line serves as a watershed for the following systems: 1. **Epithelium:** Above the line, the mucosa is lined by **simple columnar epithelium** (endodermal). Below the line, it transitions to **stratified squamous non-keratinized epithelium** (ectodermal). 2. **Nerve Supply:** Above the line, the supply is **autonomic** (painless; sensitive only to stretch). Below the line, it is **somatic** via the inferior rectal nerve (highly sensitive to pain, touch, and temperature). 3. **Lymphatic Drainage:** Lymph from above the line drains to **internal iliac nodes**, whereas lymph from below the line drains to **superficial inguinal nodes** [1]. 4. **Venous Drainage:** Above the line, blood drains into the **portal system** (superior rectal vein); below the line, it drains into the **systemic system** (inferior rectal vein) [1]. ### Clinical Pearls for NEET-PG: * **Hemorrhoids:** Internal hemorrhoids (above the line) are painless, while external hemorrhoids (below the line) are painful. * **Anal Cancer:** Squamous cell carcinoma typically occurs below the line, while adenocarcinoma occurs above it. * **Portosystemic Anastomosis:** The anal canal is a key site for portosystemic shunting; portal hypertension leads to anorectal varices [1]. * **Hilton’s White Line:** Located below the pectinate line, it marks the intermuscular groove between the internal and external anal sphincters.

Q: What is the primary nerve supply to the perineum?

Pudendal nerve. The **pudendal nerve (S2–S4)** is the primary somatosensory and somatomotor nerve of the perineum. Arising from the sacral plexus, it exits the pelvis through the greater sciatic foramen and re-enters through the lesser sciatic foramen via **Alcock’s canal** (pudendal canal). It is the "nerve of the perineum" because it supplies the skin of the external genitalia and the muscles of the urogenital and anal triangles. ### **Analysis of Options:** * **A. Pudendal Nerve (Correct):** It provides the main sensory supply to the perineal skin and motor supply to the external urethral sphincter, external anal sphincter, and the muscles of the superficial and deep perineal pouches. * **B. Inferior Rectal Nerve:** This is actually a **branch** of the pudendal nerve. While it supplies the external anal sphincter and the perianal skin, it is not the "primary" nerve but rather a component of the pudendal system. * **C. Pelvic Splanchnic Nerves:** These are **parasympathetic** nerves (S2–S4) that supply the pelvic viscera (bladder, rectum, and erectile tissues) rather than the somatic structures of the perineum. * **D. Hypogastric Plexus:** This is part of the **autonomic** nervous system (sympathetic and parasympathetic) providing innervation to internal pelvic organs, not the somatic innervation of the perineum. ### **High-Yield NEET-PG Pearls:** * **Pudendal Nerve Block:** Performed by palpating the **ischial spine** transvaginally. The anesthetic is injected near the spine to provide regional anesthesia for episiotomy or forceps delivery. * **Root Value:** S2, S3, S4 (Keep the "poop" off the floor). * **Course:** It is the only nerve that exits the pelvis and then re-enters it. * **Branches:** 1. Inferior rectal nerve, 2. Perineal nerve, 3. Dorsal nerve of the penis/clitoris.

Q: Through which of the following ligaments of the uterus does Sampson's artery run?

Round ligament. **Explanation:** **Sampson’s artery** is a branch of the **uterine artery** (forming an anastomosis with the ovarian artery) that runs specifically within the **Round ligament of the uterus**. [1] 1. **Why the Round Ligament is Correct:** The round ligament originates at the uterine horns and travels through the inguinal canal to the labia majora. [2] Sampson’s artery travels within this ligament, providing a secondary source of blood supply to the uterus. Its clinical significance lies in its potential to cause significant bleeding if not properly ligated during a hysterectomy. 2. **Analysis of Incorrect Options:** * **Broad Ligament:** While the round ligament is technically contained within the folds of the broad ligament, the artery is specifically associated with the round ligament itself. The broad ligament primarily contains the uterine and ovarian vessels. [1] * **Cardinal Ligament (Mackenrodt’s):** This ligament is located at the base of the broad ligament and transmits the **uterine artery** and vein. It is the primary support for the uterus. * **Suspensory Ligament (Infundibulopelvic):** This ligament connects the ovary to the pelvic wall and contains the **ovarian artery** and vein. [1] **High-Yield Clinical Pearls for NEET-PG:** * **Sampson’s Artery:** It is a classic "trap" in pelvic surgery; failure to control it during the division of the round ligament can lead to a hematoma. * **Ureter Relation:** The ureter passes **under** the uterine artery ("water under the bridge") within the cardinal ligament, approximately 1–2 cm lateral to the cervix. * **Embryology:** The round ligament is a remnant of the **gubernaculum**.

Q: Lymphatics from the spongy urethra drain into which of the following lymph nodes?

Deep inguinal nodes. The lymphatic drainage of the male urethra is a high-yield topic for NEET-PG, as it follows a specific segmental pattern based on embryological origin and anatomical location. ### **Explanation** The **spongy (penile) urethra** is the longest part of the male urethra, contained within the corpus spongiosum. Its lymphatic vessels travel alongside the deep dorsal vein of the penis. These vessels bypass the superficial nodes and drain directly into the **Deep Inguinal Lymph Nodes** (specifically Cloquet’s node) and subsequently into the external iliac nodes. ### **Analysis of Options** * **Deep Inguinal Nodes (Correct):** These receive lymph from the glans penis and the spongy urethra. * **Superior (Superficial) Inguinal Nodes (Incorrect):** These drain the skin of the penis, the scrotum, and the anal canal (below the pectinate line), but not the deep structures like the spongy urethra. * **Internal Iliac Nodes (Incorrect):** These primarily drain the **prostatic and membranous** portions of the urethra. * **Sacral Nodes (Incorrect):** These drain the posterior pelvic wall and parts of the rectum/prostate, but have no direct role in urethral drainage. ### **High-Yield Clinical Pearls** * **Prostatic & Membranous Urethra:** Drain to **Internal Iliac** and External Iliac nodes. * **Glans Penis:** Drains to **Deep Inguinal** nodes (often bilateral). * **Scrotum:** Drains to **Superficial Inguinal** nodes (Note: The Testis drains to **Para-aortic** nodes due to its abdominal origin). * **Rule of Thumb:** If the structure is "deep" or "internal" in the distal perineum (like the glans or spongy urethra), think Deep Inguinal; if it is "proximal/pelvic," think Internal Iliac.

Q: All of the following are branches of the internal iliac artery EXCEPT?

Inferior epigastric artery. The **internal iliac artery** is the principal artery of the pelvis. It divides at the upper margin of the greater sciatic foramen into an **anterior division** and a **posterior division**. ### Why Option B is Correct: The **inferior epigastric artery** is a branch of the **external iliac artery**, not the internal iliac [1]. It arises just proximal to the inguinal ligament, ascends along the medial margin of the deep inguinal ring, and enters the rectus sheath to anastomose with the superior epigastric artery [1]. ### Why Other Options are Incorrect: * **A. Inferior vesical artery:** This is a branch of the **anterior division** of the internal iliac artery (found in males; in females, it is replaced by the vaginal artery). It supplies the bladder, prostate, and seminal vesicles. * **C. Iliolumbar artery:** This is the first branch of the **posterior division** of the internal iliac artery. It ascends posterior to the psoas major to supply the iliacus muscle and the cauda equina. * **D. Internal pudendal artery:** This is a terminal branch of the **anterior division**. It exits the pelvis through the greater sciatic foramen and enters the perineum via the lesser sciatic foramen to supply the external genitalia. ### High-Yield NEET-PG Pearls: * **Posterior Division Mnemonic (P-I-L):** **P**osterior division gives only three branches: **P**osterior intercostal (Lateral sacral), **I**liolumbar, and **S**uperior gluteal. * **Corona Mortis:** An anatomical variant where an abnormal anastomosis exists between the inferior epigastric (external iliac system) and the obturator artery (internal iliac system). It is a critical landmark in hernia surgeries. * **Uterine Artery:** A branch of the anterior division, it crosses **superior** to the ureter ("Water under the bridge").

Q: The prostate is supplied by all the following arteries except?

Superior vesical artery. The prostate gland is a pelvic organ situated inferior to the urinary bladder. Its arterial supply is derived primarily from the branches of the internal iliac artery. **Why Superior Vesical Artery is the correct answer:** The **Superior Vesical Artery** supplies the apex (upper part) of the urinary bladder and the distal ureter [1]. It does not contribute to the prostatic blood supply. It is the patent proximal part of the fetal umbilical artery. **Analysis of other options (Supplying Arteries):** The prostate receives its blood supply from three main sources: * **Inferior Vesical Artery (Option A):** This is the **primary** arterial supply [1]. It gives off "prostatic branches" that enter the prostate at the bladder-prostate junction. * **Middle Rectal Artery (Option C):** This artery provides accessory branches to the posterior aspect of the prostate. * **Internal Pudendal Artery (Option D):** It provides small branches to the inferior aspect of the gland and the surrounding perineal structures. **NEET-PG High-Yield Pearls:** 1. **Venous Drainage:** The prostate is drained by the **Prostatic Venous Plexus** (located between the true and false capsules). This plexus communicates with the **Internal Vertebral Venous Plexus (Batson’s Plexus)**, explaining why prostate cancer frequently metastasizes to the lumbar vertebrae. 2. **Zones:** Most carcinomas arise in the **Peripheral Zone**, while Benign Prostatic Hyperplasia (BPH) typically occurs in the **Transition Zone**. 3. **Capsule:** The "True Capsule" is formed by the condensation of the peripheral stroma of the gland, whereas the "False Capsule" is derived from the pelvic fascia. The venous plexus lies between these two.

Q: In a bulbous urethral injury, extravasated urine can spread into which of the following structures?

Scrotum. The spread of extravasated urine in a bulbous urethral injury is determined by the attachments of the **superficial perineal fascia (Colles’ fascia)**. When the bulbous urethra is ruptured (typically due to a "straddle injury"), urine escapes into the **superficial perineal space**. Colles’ fascia is continuous with **Scarpa’s fascia** of the abdominal wall and **Dartos fascia** of the penis and scrotum [1]. However, it firmly attaches to the posterior edge of the perineal membrane and the fascia lata of the thigh. Therefore, urine is confined by these attachments and can only track into the **scrotum**, the **penis**, and the **lower abdominal wall** (deep to Scarpa’s fascia). **Analysis of Options:** * **A. Scrotum (Correct):** Due to the continuity of Colles’ fascia with Dartos fascia, the scrotum is a primary site for fluid accumulation. * **B. Ischiorectal fossa:** This is located posterior to the superficial perineal space. The attachment of Colles’ fascia to the posterior border of the perineal membrane prevents urine from tracking backward into this fossa. * **C. Deep perineal space:** This space is separated from the superficial space by the tough **perineal membrane**. A bulbous urethral injury occurs below this membrane. [1] * **D. Thigh:** Urine cannot spread into the thigh because Colles’ fascia fuses with the **fascia lata** just distal to the inguinal ligament (Holden’s line). **Clinical Pearls for NEET-PG:** * **Butterfly Bruising:** Extravasation in the perineum often presents as a butterfly-shaped swelling. * **Holden’s Line:** This is the line of fusion between Scarpa’s fascia and fascia lata; it prevents urine from descending into the thigh. * **Membranous Urethra Rupture:** Unlike bulbous rupture, a rupture of the membranous urethra (often associated with pelvic fractures) leads to extravasation into the **deep perineal space** or the **retropubic space (Cave of Retzius)** [2].

Question 1

All of the following are branches of the uterine artery except?

Accepted Answer

Obturator artery

Answer

Spiral artery

Answer

Radial artery

Answer

Sampson artery

Question 2

The pectinate line is an important anatomical landmark because it signifies a division in which of the following aspects?

Accepted Answer

All of the above

Answer

Nerve supply

Answer

Type of epithelium

Answer

Lymphatic and venous drainage

Question 3

What is the primary nerve supply to the perineum?

Accepted Answer

Pudendal nerve

Answer

Inferior rectal nerve

Answer

Pelvic splanchnic nerves

Answer

Hypogastric plexus

Question 4

Through which of the following ligaments of the uterus does Sampson's artery run?

Accepted Answer

Round ligament

Answer

Broad ligament

Answer

Cardinal ligament

Answer

Suspensory ligament

Question 5

Lymphatics from the spongy urethra drain into which of the following lymph nodes?

Accepted Answer

Deep inguinal nodes

Answer

Superior inguinal nodes

Answer

Internal inguinal nodes

Answer

Sacral nodes

Question 6

Which structure forms the false ligaments/peritoneal ligaments of the uterus?

Accepted Answer

The peritoneum of the rectouterine pouch (Pouch of Douglas)

Answer

Fibromuscular bands

Answer

Peritoneal folds

Answer

Pelvic diaphragm

Question 7

Which of the following statements is TRUE regarding the fallopian tube?

Accepted Answer

It is surrounded by peritoneum on all sides except along the line of attachment of the mesosalpinx.

Answer

It is lined entirely by ciliated columnar epithelium.

Answer

It possesses a submucous layer.

Answer

It undergoes shedding during the menstrual cycle.

Question 8

All of the following are branches of the internal iliac artery EXCEPT?

Accepted Answer

Inferior epigastric artery

Answer

Inferior vesical artery

Answer

Iliolumbar artery

Answer

Internal pudendal artery

Question 9

The prostate is supplied by all the following arteries except?

Accepted Answer

Superior vesical artery

Answer

Inferior vesical artery

Answer

Middle rectal artery

Answer

Internal pudendal artery

Question 10

In a bulbous urethral injury, extravasated urine can spread into which of the following structures?

Accepted Answer

Scrotum

Answer

Ischiorectal fossa

Answer

Deep perineal space

Answer

Thigh

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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