Pelvis and Perineum Practice Questions

Q: Which of the following is not enclosed within the mesorectal fascia?

Inferior rectal vein. The **mesorectum** is a fatty connective tissue envelope surrounding the rectum, bounded by the **mesorectal fascia** (a continuation of the pelvic fascia). Understanding its contents is crucial for oncological surgeries like Total Mesorectal Excision (TME). [1] ### Why the Inferior Rectal Vein is the Correct Answer: The **Inferior rectal vein** is a tributary of the internal pudendal vein (systemic circulation). It originates near the anal canal, below the levator ani muscle, and travels within the **Alcock’s canal (pudendal canal)** and the ischioanal fossa. Therefore, it lies outside the mesorectal fascia. [1] ### Why the Other Options are Incorrect: * **Pararectal nodes:** These are the primary lymphatic drainage stations for the rectum and are located within the mesorectal fat, making them a critical component to remove during cancer surgery. * **Superior rectal vein:** This is the direct continuation of the inferior mesenteric vein. It descends within the sigmoid mesocolon and enters the mesorectum to drain the rectal mucosa. [1] * **Inferior mesenteric plexus:** The autonomic nerve fibers (sympathetic and parasympathetic) follow the superior rectal artery into the mesorectum to supply the rectal wall. ### High-Yield Clinical Pearls for NEET-PG: * **Total Mesorectal Excision (TME):** This is the "gold standard" surgical technique for rectal cancer. The surgeon must stay in the "holy plane" (the avascular plane between the mesorectal fascia and the parietal pelvic fascia) to ensure complete removal of lymph nodes and avoid bleeding. * **Blood Supply:** The **Superior rectal artery** (terminal branch of IMA) is the main artery within the mesorectum. * **Venous Drainage:** The Superior rectal vein drains into the **Portal system**, while Middle and Inferior rectal veins drain into the **Systemic system** (Internal Iliac/Pudendal). [1] This creates a clinically significant portosystemic anastomosis.

Q: The internal pudendal artery gives rise to which of the following arteries?

Inferior rectal artery. **Explanation:** The **internal pudendal artery** is a terminal branch of the anterior division of the internal iliac artery. It exits the pelvis through the greater sciatic foramen and enters the perineum via the lesser sciatic foramen, passing through the **pudendal (Alcock’s) canal**. Within this canal, it gives off the **inferior rectal artery**, which pierces the medial wall of the canal to supply the lower half of the anal canal (below the pectinate line), the anal sphincters, and the perianal skin. **Analysis of Incorrect Options:** * **A. Superior rectal artery:** This is the direct continuation of the **inferior mesenteric artery**. It supplies the upper part of the rectum. * **B. Middle rectal artery:** This arises directly from the **internal iliac artery** (anterior division). It supplies the middle and lower rectum and forms an important anastomosis between the portal and systemic circulations. * **C. Median sacral artery:** This is a small, unpaired branch arising from the **posterior aspect of the abdominal aorta**, just above its bifurcation. **High-Yield NEET-PG Pearls:** * **The Rectal Blood Supply Rule:** The rectum is supplied by three arteries from three different sources: Superior (IMA), Middle (Internal Iliac), and Inferior (Internal Pudendal). * **Pudendal Nerve:** Like the artery, the pudendal nerve also gives off the inferior rectal nerve, which provides motor supply to the external anal sphincter and sensory supply below the pectinate line. * **Clinical Correlation:** In cases of ischioanal abscess drainage, the internal pudendal vessels and nerve are protected by their location in the lateral wall of the ischioanal fossa (Alcock’s canal).

Q: Which of the following is NOT true about nervi erigentes?

They join the superior hypogastric plexus.. **Explanation:** The **nervi erigentes** (also known as pelvic splanchnic nerves) are the primary mediators of the parasympathetic supply to the pelvic viscera and the distal hindgut. **Why Option D is Correct (The False Statement):** Nervi erigentes do **not** join the superior hypogastric plexus. Instead, they join the **inferior hypogastric plexus** (pelvic plexus). The superior hypogastric plexus is located at the bifurcation of the aorta and consists almost entirely of sympathetic fibers. The inferior hypogastric plexus is where sympathetic fibers (from the hypogastric nerves) and parasympathetic fibers (from nervi erigentes) merge to distribute to pelvic organs. **Analysis of Other Options:** * **Option A & B:** These are correct. Nervi erigentes are **autonomic** nerves representing the **sacral parasympathetic outflow** (craniosacral system). * **Option C:** This is correct. They arise from the **ventral rami of S2, S3, and S4** spinal nerves. These preganglionic fibers travel to the pelvic plexus to synapse in terminal ganglia within or near the organ walls. **High-Yield Clinical Pearls for NEET-PG:** * **Function:** Their name "erigentes" refers to their role in **erection** (vasodilation of corpora cavernosa). Remember: **P**oint (Parasympathetic/Erection) and **S**hoot (Sympathetic/Ejaculation). * **Supply:** They provide motor supply to the bladder wall (detrusor) and inhibitory supply to the internal urethral sphincter, facilitating micturition. * **Surgical Significance:** During radical pelvic surgeries (like prostatectomy or rectal resection), damage to these nerves leads to **impotence** and bladder dysfunction. * **Hindgut Supply:** They provide parasympathetic innervation to the gastrointestinal tract from the distal 1/3rd of the transverse colon down to the upper anal canal.

Q: Which nerve root supplies the ovary?

T10. The nerve supply to the ovary is derived from the **ovarian plexus**, which accompanies the ovarian artery. The sensory (afferent) fibers from the ovary travel alongside the sympathetic nerves to reach the spinal cord. [1] 1. **Why T10 is correct:** The ovaries develop embryologically in the high posterior abdominal wall near the level of the kidneys (L1 level) and subsequently descend into the pelvis. During this descent, they carry their neurovascular supply with them. The preganglionic sympathetic fibers originate from the **T10 and T11** spinal segments. [1] Therefore, pain from the ovary is referred to the **T10 dermatome**, which is the umbilical region. 2. **Why the other options are incorrect:** * **T9:** This segment primarily supplies the upper abdominal viscera, such as the stomach and duodenum. * **L4:** This is a lumbar segment involved in the nerve supply to the lower limbs and pelvic floor, but it does not provide primary sensory innervation to the gonads. * **T1:** This segment is part of the brachial plexus and supplies the intrinsic muscles of the hand and the skin of the medial arm. **Clinical Pearls for NEET-PG:** * **Referred Pain:** Because the ovary and the appendix both share the **T10** nerve root for sensory innervation, acute ovarian pathologies (like a ruptured cyst or torsion) can clinically mimic **appendicitis**. * **Lymphatic Drainage:** Due to their site of origin, the ovaries drain into the **Para-aortic (Pre-aortic) lymph nodes**, not the inguinal nodes [1]. * **Testis Analogy:** In males, the testis also shares the same embryological origin and nerve supply (**T10**); hence, testicular pain is also referred to the umbilicus.

Question 1

A 35-year-old man is admitted to the hospital after being kicked in the groin while playing football. During physical examination, it is noted that the left testicle of the patient is swollen. An MRI examination reveals coagulation of blood in the veins draining the testis. Into which of the following veins would a thrombus most likely pass first from the injured area?

Accepted Answer

Left renal vein

Answer

Inferior vena cava

Answer

Left inferior epigastric vein

Answer

Left internal pudendal vein

Question 2

Which of the following statements about the lymphatics of the vulva is true?

Accepted Answer

Lymphatics of the vulva traverse the labia from medial to lateral.

Answer

Lymphatics of the vulva do not cross the labiocrural fold.

Answer

Lymphatics of the vulva drain directly into deep femoral glands.

Answer

Lymphatics of the vulva do not freely communicate with each other.

Question 3

Which of the following is not enclosed within the mesorectal fascia?

Accepted Answer

Inferior rectal vein

Answer

Pararectal nodes

Answer

Superior rectal vein

Answer

Inferior mesenteric plexus

Question 4

The internal pudendal artery gives rise to which of the following arteries?

Accepted Answer

Inferior rectal artery

Answer

Superior rectal artery

Answer

Middle rectal artery

Answer

Median sacral artery

Question 5

Which of the following is NOT true about nervi erigentes?

Accepted Answer

They join the superior hypogastric plexus.

Answer

They are autonomic nerves.

Answer

They represent parasympathetic outflow.

Answer

They arise from the ventral rami of S2, S3, and S4.

Question 6

Loss of sensation of the scrotum and root of the penis after herniotomy is due to injury of which nerve?

Accepted Answer

Ilioinguinal nerve

Answer

Iliohypogastric nerve

Answer

Genitofemoral nerve

Answer

Obturator nerve

Question 7

Which of the following are superficial perineal muscles?

Accepted Answer

Superficial transverse perinei, bulbospongiosus, and ischiocavernosus

Answer

Superficial transverse perinei and bulbospongiosus

Answer

Bulbospongiosus and ischiocavernosus

Answer

Superficial transverse perinei, ischiocavernosus, and ilio-coccygeus

Question 8

Which nerve root supplies the ovary?

Accepted Answer

T10

Answer

T9

Answer

L4

Answer

T1

Question 9

Gartner's duct is present in which of the following locations?

Accepted Answer

Broad ligament of uterus

Answer

Vaginal wall

Answer

Transcervical ligament

Answer

Perineal body

Question 10

A 38-year-old woman visits her gynecologist for a routine Pap smear examination. During the collection of cells from her uterine cervix, she feels mild pain. Which of the following areas is most likely to experience referred pain during this procedure?

Accepted Answer

Perineum and lateral portion of the thigh

Answer

Suprapubic region

Answer

Umbilical region

Answer

Inguinal region

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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