Pelvis and Perineum Practice Questions

Q: The branches of the anterior division of the internal iliac artery include all except.

Superior gluteal. **Superior gluteal** - The **superior gluteal artery** is a branch of the **posterior division** of the internal iliac artery. - It exits the pelvis through the **greater sciatic foramen**, above the piriformis muscle, to supply the **gluteal muscles**. *Internal pudendal* - The internal pudendal artery is a prominent branch of the **anterior division** of the internal iliac artery. - It supplies structures in the **perineum** and external genitalia. *Uterine* - The uterine artery is a branch of the **anterior division** of the internal iliac artery in females. - It is crucial for supplying blood to the **uterus** and parts of the vagina. *Obturator* - The obturator artery is a branch of the **anterior division** of the internal iliac artery. - It passes through the **obturator canal** to supply the adductor muscles of the thigh.

Q: The area bounded by the clitoris, fourchette, and labia minora is

Vestibule. ***Vestibule*** - The **vestibule** is the functional name given to the area bounded by the **clitoris**, **fourchette** (posterior commissure), and the **labia minora**. It contains the openings of the urethra and vagina [1]. - This region is crucial for both **sexual function** and **reproduction**, as it houses structures vital for these processes [1]. *Fourchette (anatomical landmark)* - The **fourchette** is the posterior junction of the **labia minora** and is part of the perineum but does not define the entire bounded area in question. - It is a **specific anatomical landmark**, whereas the question asks for a region defined by multiple boundaries, including the fourchette itself. *Vulva (external female genitalia)* - The **vulva** is the entire external female genitalia, encompassing the **labia majora**, **labia minora**, **clitoris**, and **vestibule** [2]. - It represents a **broader anatomical region** than the specific area described, which is internal to the labia minora [2]. *Fossa navicularis (a recess within the vestibule)* - The **fossa navicularis** is a small, boat-shaped depression located in the **vestibule**, specifically between the fourchette and the vaginal opening. - While it is **within the described area**, it is only a small recess and not the entire bounded region itself.

Q: Which of the following arteries gives rise to the uterine artery?

Internal iliac artery. ***Internal iliac artery*** - The **internal iliac artery** is the primary source of blood supply to the pelvis, giving rise to numerous branches, including the **uterine artery** [1]. - The **uterine artery** then courses medially to supply the uterus, fallopian tubes, and upper vagina [1]. *Aorta* - The **aorta** is the main and largest artery in the body, but it is located more proximally and branches into the **common iliac arteries**, not directly the uterine artery. - The uterine artery is a more distal branch off the internal iliac artery, which is itself a branch of the common iliac artery. *Common iliac* - The **common iliac arteries** are formed by the bifurcation of the aorta and then further divide into the **internal and external iliac arteries** [2]. - The uterine artery arises from the internal iliac, not directly from the common iliac [1]. *External iliac* - The **external iliac artery** primarily supplies the lower limbs and does not directly give rise to any arteries supplying the reproductive organs. - Its main continuation is the **femoral artery** after passing beneath the inguinal ligament.

Q: Which of the following statements about the sphincter urethrae is false?

Located at bladder neck. ***Located at bladder neck*** - The **external urethral sphincter** (sphincter urethrae) is located in the **deep perineal pouch** (urogenital diaphragm), surrounding the membranous urethra, **NOT at the bladder neck**. - The **internal urethral sphincter** (involuntary smooth muscle) is located at the **bladder neck** in males, but the external sphincter is distinctly separate and more distal [1]. - This statement is **FALSE** and is the correct answer. *Voluntary* - The **sphincter urethrae** (external urethral sphincter) is composed of **skeletal muscle** and is under **voluntary control** [1]. - This voluntary control is essential for **urinary continence** and allows conscious interruption of urination. *Originates from the pelvic diaphragm* - The **external urethral sphincter** is located in the **deep perineal pouch**, which is **separate from and inferior to** the **pelvic diaphragm** (levator ani and coccygeus). - While this statement could be considered anatomically imprecise, the sphincter is more accurately described as part of the **urogenital diaphragm** rather than originating from the pelvic diaphragm proper. - It is intimately associated with the **perineal membrane** and other muscles of the deep perineal pouch. *Supplied by the internal pudendal nerve* - The **pudendal nerve** (specifically the **perineal branch**) provides **somatic motor innervation** to the external urethral sphincter. - This innervation allows **voluntary contraction** and relaxation of the sphincter during micturition.

Q: In bladder injury, which of the following is the least likely site of referred pain?

Upper part of thigh. ***Upper part of thigh*** - Pain from bladder injury is typically referred to areas innervated by the **S2-S4 spinal segments**, which supply the perineum, external genitalia, and posterior thigh. - The upper part of the thigh, particularly the anterior or medial aspects, is primarily innervated by the **lumbar plexus (L2-L4)**, making it a less common site for bladder pain referral. *Lower abdominal wall* - The bladder's superior surface peritoneum is innervated by **T11-L2 sympathetic fibers**, allowing for referred pain to the suprapubic and lower abdominal regions. - This is a common pattern for bladder distension or inflammation, as the peritoneum lining the bladder wall can stretch and trigger these fibers. *Flank* - While referred pain to the flank is more typical of **kidney or ureteral pathology**, severe bladder distension or irritation, especially if it irritates surrounding structures or peritoneum, can sometimes cause referred pain in this region. - The sensory innervation from the bladder can overlap with areas that refer to the flank, particularly through the **sympathetic pathways**. *Penis* - The penis receives sensory innervation from the **pudendal nerve (S2-S4)**, which shares spinal segments with the detrusor muscle of the bladder. - This common innervation pathway makes the penis a very likely site for referred pain from bladder injury or irritation, often described as a deep, radiating pain.

Q: In prostatic metastasis, the site most commonly involved is which one?

Obturator nodes. ***Obturator nodes*** - The **obturator nodes** are a primary site for metastatic spread from the prostate due to their close proximity and direct lymphatic drainage pathways. - Prostate cancer cells often spread via the **lymphatic system** to regional lymph nodes before disseminating to distant sites. **Perivesical nodes** * While also regional, perivesical nodes are less frequently the _initial_ or most common site of metastasis compared to the obturator and internal iliac nodes. * Lymphatic drainage from the prostate primarily follows pathways that lead to obturator and internal iliac nodes first. **Pre-sacral nodes** * Pre-sacral nodes are considered more distant regional nodes compared to the obturator nodes and are typically involved later in the metastatic process. * Their involvement often indicates a more advanced stage of nodal metastasis. **Para-aortic nodes** * Para-aortic nodes are considered distant metastases for prostate cancer, indicating widespread disease. * Metastasis to para-aortic nodes usually occurs after involvement of more proximal regional nodes like the obturator and internal iliac nodes.

Q: Which of the following statements about the Levator Ani is false?

Attached to the pelvic brim.. Attached to the pelvic brim - This statement is **false** because the levator ani does not attach to the pelvic brim (the inlet of the true pelvis). - The levator ani originates from: the **posterior surface of the body of pubis**, the **tendinous arch of obturator fascia** (thickening of obturator fascia on lateral pelvic wall), and the **ischial spine**. - All these attachments are on the **lateral pelvic wall below the pelvic brim**, not at the pelvic brim itself. - The muscles insert into the **perineal body**, **anococcygeal ligament**, and walls of pelvic viscera. *Converges downwards & medially* - This statement is **true** - the levator ani muscles arise from lateral attachments on the pelvic sidewalls and converge **medially and downward** toward the midline. - This creates the characteristic **funnel-shaped pelvic diaphragm** that narrows inferiorly. - The fibers run inferomedially to form a muscular sling supporting pelvic structures. *Supports pelvic viscera* - This is the **primary function** of the levator ani muscle group [1]. - It forms a muscular floor that supports the **bladder, uterus/prostate, and rectum**, preventing prolapse. - The muscle maintains the position of pelvic organs against intra-abdominal pressure. *Made up of iliococcygeus, pubococcygeus, and puborectalis* - This statement is **correct** - the levator ani consists of three main components [1]: - **Puborectalis** - forms a sling around the anorectal junction, important for fecal continence [1]. - **Pubococcygeus** - middle portion, supports pelvic viscera [1]. - **Iliococcygeus** - most posterior portion, extends from ischial spine to coccyx [1].

Q: Sensory afferent fibers from the fallopian tubes ascend to:

T 10. ***T 10*** - The **fallopian tubes** and **ovaries** share sensory innervation primarily through the **T10** and **T11** spinal segments. [2] - This is consistent with the **visceral pain** referral pattern often experienced in the periumbilical region during pain originating from these organs. [2] *T 8* - Sensory innervation to **T8** primarily covers the epigastric region, which is typically associated with organs higher in the abdomen, such as the stomach and gallbladder. [1] - Pain from the fallopian tubes is generally referred lower than the epigastrium. *L 2* - The **L2** spinal segment mainly innervates structures in the lower abdomen and upper thigh, like parts of the colon and the hip joint. [1] - This dermatomal level is too low to be the primary sensory afferent pathway for the fallopian tubes. *L 4* - **L4** sensory innervation is largely associated with the knee and medial calf regions. - It does not correspond to the visceral sensory pathways from pelvic organs like the fallopian tubes.

Q: What is the landmark for performing a pudendal nerve block?

Ischial spine. ***Ischial spine*** - The **ischial spine** serves as a crucial anatomical landmark for a pudendal nerve block as it is where the **pudendal nerve crosses dorsally** just before it enters Alcock's canal. - Palpating the ischial spine allows for precise needle placement to anesthetize the pudendal nerve, providing pain relief to the **perineum, vulva**, and **distal vagina**. *Ischial tuberosity* - The **ischial tuberosity** is a bony prominence that is inferior to the ischial spine and is a superficial landmark. - While it helps in general orientation of the perineum, it is **not the direct landmark** for the pudendal nerve itself, which is located more superiorly and medially in relation to the main nerve trunk. *Sacroiliac joint* - The **sacroiliac joint** connects the sacrum and the ilium and is involved in transmitting weight from the upper body to the lower limbs. - It is **anatomically distant** from the pudendal nerve's path and is not used as a landmark for a pudendal nerve block. *None of the options* - This option is incorrect because the **ischial spine** is a recognized and essential landmark for performing a pudendal nerve block.

Question 1

The branches of the anterior division of the internal iliac artery include all except.

Accepted Answer

Superior gluteal

Answer

Uterine

Answer

Obturator

Answer

Internal pudendal

Question 2

The area bounded by the clitoris, fourchette, and labia minora is

Accepted Answer

Vestibule

Answer

Fourchette

Answer

Vulva

Answer

Fossa navicularis

Question 3

Which of the following arteries gives rise to the uterine artery?

Accepted Answer

Internal iliac artery

Answer

Common iliac

Answer

External iliac

Answer

Aorta

Question 4

Which of the following statements about the sphincter urethrae is false?

Accepted Answer

Located at bladder neck

Answer

Voluntary

Answer

Originates from the pelvic diaphragm

Answer

Supplied by the internal pudendal nerve

Question 5

In bladder injury, which of the following is the least likely site of referred pain?

Accepted Answer

Upper part of thigh

Answer

Lower abdominal wall

Answer

Flank

Answer

Penis

Question 6

In prostatic metastasis, the site most commonly involved is which one?

Accepted Answer

Obturator nodes

Answer

Perivesical nodes

Answer

Pre-sacral nodes

Answer

Para-aortic nodes

Question 7

Which of the following statements about the Levator Ani is false?

Accepted Answer

Attached to the pelvic brim.

Answer

Converges downwards & medially

Answer

Made up of iliococcygeus, pubococcygeus, and puborectalis.

Answer

Supports pelvic viscera.

Question 8

Which of the following statements about the pudendal nerve is true?

Accepted Answer

Has a dorsal nerve branch which provides sensory innervation to the clitoris/penis.

Answer

Enters the pelvis through the lesser sciatic foramen only.

Answer

Runs in a canal formed by the levator ani fascia.

Answer

Has a dorsal branch which provides motor innervation to the glans penis.

Question 9

Sensory afferent fibers from the fallopian tubes ascend to:

Accepted Answer

T 10

Answer

T 8

Answer

L 2

Answer

L 4

Question 10

What is the landmark for performing a pudendal nerve block?

Accepted Answer

Ischial spine

Answer

Ischial tuberosity

Answer

Sacroiliac joint

Answer

None of the options

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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