Pelvis and Perineum Practice Questions

Q: One of the risks of the endometrial biopsy that was performed on this patient is perforation of the uterus. The endometrial biopsy device is placed through the cervix and into the endometrial cavity. If complete perforation occurs, what is the sequence of layers that the biopsy device would penetrate prior to entering the peritoneal cavity?

Endometrium, myometrium, serosa. ***Endometrium, myometrium, serosa*** - The **endometrium** is the innermost lining layer of the uterus and is the first layer encountered by the biopsy device within the uterine cavity [1]. - The **myometrium** is the thick muscular middle layer of the uterine wall, which lies superficial to the endometrium and deep to the serosa [1]. - The **peritoneum** (also known as the serosa or perimetrium when referring to the uterus) is the outermost layer of the uterus that covers the myometrium, and once perforated, the device enters the peritoneal cavity [4]. *Ovary, fallopian tube, broad ligament* - The **ovaries** and **fallopian tubes** are located lateral to the uterus, and the **broad ligament** is a fold of peritoneum that supports the uterus, ovaries, and fallopian tubes [3]. - These structures are not directly superior or immediately adjacent to the uterine wall in such a way that they would be sequentially penetrated during a direct anterior-posterior perforation from the uterine cavity. *Round ligament, cardinal ligament, uterosacral ligament* - The **round, cardinal, and uterosacral ligaments** are supportive structures of the uterus located externally to the uterine wall. - They would not be encountered in a direct transmural penetration from within the uterine cavity into the peritoneal cavity. *Serosa, myometrium, endometrium* - This sequence describes penetration in the reverse direction, from the **peritoneal cavity** inward towards the uterine lumen. - An endometrial biopsy device starts within the **endometrial cavity**, so it would penetrate from inside out [2].

Q: Uterosacral ligament contains

Sympathetic and parasympathetic nerves. ***Sympathetic and parasympathetic nerves*** - The **uterosacral ligaments** are a component of the pelvic connective tissue that extends from the cervix to the sacrum, richly innervated [1]. - These ligaments are crucial for providing **nervous input** to the uterus and surrounding organs, including both **sympathetic** and **parasympathetic fibers**. *Mainly smooth muscle* - While ligaments are connective tissue, the **uterosacral ligaments** are primarily composed of **collagen** and **elastic fibers**, with some smooth muscle components, but not "mainly" smooth muscle [1]. - Their primary function is support, not contraction, distinguishing them from structures predominantly composed of smooth muscle. *Contain uterine vessels* - The **uterine vessels** (arteries and veins) are primarily located within the **broad ligament** (specifically, in the mesometrium) as they approach the uterus from the lateral pelvic wall. - While there might be small anastomosing vessels, the main uterine supply does not run within the uterosacral ligaments. *Ureters* - The **ureters** course through the pelvic cavity to reach the bladder, but they are not contained within the uterosacral ligaments. - They pass more laterally, close to the lateral fornix of the vagina, superior to the uterine artery, often remembered by the phrase "**water under the bridge**."

Q: Radial arteries bifurcate at which junction in the uterine body

At endometrium - myometrium junction.. ***At endometrium - myometrium junction.*** - The **radial arteries** are branches of the arcuate arteries that penetrate the **myometrium**. [1] - They extend to the **endometrial-myometrial junction**, where they bifurcate into the **straight** and **spiral arteries** that supply the endometrium. [2] *At cervico - vaginal junction.* - The **cervico-vaginal junction** is located at the lower end of the cervix, connecting to the vagina. - This region is supplied by branches of the **vaginal artery** and the **cervical branch** of the uterine artery, not the radial arteries. *At junction of uterus and cervix.* - The **junction of the uterus and cervix** (isthmus) is primarily supplied by the **uterine artery** and its main branches. [2] - Radial arteries are specifically found within the uterine body and extend towards the endometrium. *At junction of uterus and fallopian tube.* - The **junction of the uterus and fallopian tube** (cornu) is supplied by the **utero-ovarian anastomoses** and branches of the uterine and ovarian arteries. [2] - This area is distinct from the region where radial arteries bifurcate to supply the endometrium.

Q: Most important support of the uterus for preventing prolapse is:

Transverse cervical ligament. ***Transverse cervical ligament*** - The **transverse cervical ligaments (Cardinal ligaments)** are the primary static support for the uterus, anchoring the cervix and upper vagina to the lateral pelvic walls [1]. - They contain the **uterine artery and veins** and prevent the uterus from prolapsing downwards. *Round ligament of ovary* - This ligament connects the **medial pole of the ovary to the uterus**, specifically the lateral aspect of the uterus, just below the fallopian tubes. - Its primary role is to tether the ovary to the uterus and is not a significant support against uterine prolapse. *Pelvic floor* - The **pelvic floor muscles** provide dynamic support to the pelvic organs, including the uterus [2]. - While crucial for general organ support and continence, the pelvic floor is considered a secondary, rather than the most important primary, support for preventing immediate uterine prolapse compared to the strong static ligaments. *Round ligament of uterus* - The **round ligament of the uterus** extends from the uterus, through the inguinal canal, to the labia majora. - Its function is to help maintain the **anteversion of the uterus** and is a weak support for preventing uterine prolapse.

Q: What is the extension of the vaginal lumen around the intravaginal part of the uterine cervix called?

Fornix (vaginal recess). ***Fornix (vaginal recess)*** - The **fornix** is the anatomical term for the arched, blind-ended recess formed by the extension of the vaginal lumen around the protruding **intravaginal part of the uterine cervix** [1]. - It is typically divided into anterior, posterior, and two lateral fornices [1]. *Rectouterine pouch (pouch of Douglas)* - This is a peritoneal recess located between the **rectum and the uterus**, not an extension of the vaginal lumen itself [1]. - It is the **lowest point of the peritoneal cavity** in females and can accumulate fluid. *Uterine cavity (lumen)* - This refers to the space within the **body of the uterus**, which is superior to the cervix [3]. - It is lined by the **endometrium** and is where a fertilized egg implants [2]. *Cervical canal (passage through cervix)* - The **cervical canal** is the passage that runs through the **cervix**, connecting the uterine cavity to the vagina. - It is an internal channel, not the surrounding extension of the vaginal lumen.

Q: Which of the following anatomic boundary separates the true pelvis from the false pelvis?

Linea terminalis. ***Linea terminalis*** - The **linea terminalis** is the imaginary line forming the boundary between the **true (lesser) pelvis** and the **false (greater) pelvis** [1]. - It delineates the **pelvic inlet** and defines the space where the pelvic organs are located [1]. *Ischial spine* - The **ischial spine** is a bony prominence within the **true pelvis** that serves as an important landmark for assessing fetal station during labor. - It does not separate the true from the false pelvis but is entirely contained within the true pelvis [1]. *Arcuate line* - The **arcuate line** is a part of the **linea terminalis**, specifically located on the ilium. - It forms only a segment of the complete boundary that separates the true and false pelvis. *Pectineal line* - The **pectineal line** (pecten pubis) is another component of the **linea terminalis**, located on the superior ramus of the pubic bone. - Like the arcuate line, it is a part of the overall boundary and not the entire separating structure itself.

Q: The anatomical space in the external female genitalia that contains the urethral and vaginal openings is the:

Vestibule. ***Vestibule*** - The **vestibule** is the anatomical space bordered by the labia minora, where the urethral and vaginal openings are located [1]. - It also contains the **the two Skene's ducts which open in the vestibule on either side of the external urethral meatus as well as the ducts of the greater vestibular (Bartholin's) glands** [1]. *Fossa navicularis* - The **fossa navicularis** is a small depression or boat-shaped area located between the fourchette and the vaginal opening. - It is a specific part of the **vestibule**, not the entire space containing multiple openings. *Labia minora* - The **labia minora** are two folds of skin that enclose the vestibule. - They form the **boundaries** of the vestibule, rather than being the space itself [1]. *Fourchette* - The **fourchette** is the posterior fold of tissue formed by the fusion of the labia minora. - It marks the **posterior boundary** of the vestibule, but is not the vestibule itself.

Q: Bartholin gland opening is at:

Inner side of labia minora external to hymen. ***Inner side of labia minora external to hymen*** - The **Bartholin glands** (also known as greater vestibular glands) are located on either side of the **vaginal opening**. [1] - Their ducts open into the **vestibule** just outside the **hymen**, specifically between the **labia minora**. [1] *Outer side of labia minora internal to hymen* - The opening is **not on the outer side** of the labia minora but rather on the inner face defining the vestibule. [1] - The opening is **external to the hymen**, not internal. [1] *Outer side of labia minora external to hymen* - The opening is located on the **inner, medial aspect of the labia minora**, not its outer surface. [1] - While correct that it is external to the hymen, the location relative to the labia minora is inaccurate. *Inner side of labia minora internal to hymen* - The opening is indeed on the **inner side of the labia minora**, forming part of the vestibule. [1] - However, the opening is consistently positioned **external to the hymen**, not internal. [1]

Q: A 29-year-old woman with a ruptured ectopic pregnancy is admitted to a hospital for culdocentesis. A long needle on the syringe is most efficiently inserted through which of the following structures?

Posterior fornix of the vagina. ***Posterior fornix of the vagina*** - Culdocentesis is a procedure where fluid is aspirated from the **cul-de-sac (rectouterine pouch)**. - The **posterior vaginal fornix** is the thinnest and most accessible anatomical landmark for safely accessing the rectouterine pouch. *Anterior wall of the rectum* - Puncturing the **anterior rectal wall** could lead to peritonitis and is not the intended approach for culdocentesis. - The rectum is located posterior to the rectouterine pouch, making it an inappropriate entry point. *Anterior fornix of the vagina* - The **anterior fornix** is anatomically adjacent to the vesicouterine pouch (between the bladder and uterus), not the rectouterine pouch. - Puncturing this area would not access the fluid collection from a ruptured ectopic pregnancy, which accumulates in the rectouterine pouch. *Posterior wall of the uterine body* - Puncturing the **posterior wall of the uterine body** would damage the uterus and is not a route to the cul-de-sac. - The procedure aims to access the space behind the uterus, not the uterine organ itself.

Question 1

One of the risks of the endometrial biopsy that was performed on this patient is perforation of the uterus. The endometrial biopsy device is placed through the cervix and into the endometrial cavity. If complete perforation occurs, what is the sequence of layers that the biopsy device would penetrate prior to entering the peritoneal cavity?

Accepted Answer

Endometrium, myometrium, serosa

Answer

Ovary, fallopian tube, broad ligament

Answer

Round ligament, cardinal ligament, uterosacral ligament

Answer

Serosa, myometrium, endometrium

Question 2

Uterosacral ligament contains

Accepted Answer

Sympathetic and parasympathetic nerves

Answer

Mainly smooth muscle

Answer

Contain uterine vessels

Answer

Ureters

Question 3

Radial arteries bifurcate at which junction in the uterine body

Accepted Answer

At endometrium - myometrium junction.

Answer

At cervico - vaginal junction.

Answer

At junction of uterus and cervix.

Answer

At junction of uterus and fallopian tube.

Question 4

Most important support of the uterus for preventing prolapse is:

Accepted Answer

Transverse cervical ligament

Answer

Round ligament of ovary

Answer

Pelvic floor

Answer

Round ligament of uterus

Question 5

All are true regarding course of ureter in pelvis except

Accepted Answer

Obturator vessels and nerve lie medially in relation to ureter at pelvic brim

Answer

It is crossed by ovarian vessels where it enters true pelvis

Answer

Ureter pierces lateral ligament where ureteric canal is developed.

Answer

Ureter passes over bifurcation of common iliac artery

Question 6

What is the extension of the vaginal lumen around the intravaginal part of the uterine cervix called?

Accepted Answer

Fornix (vaginal recess)

Answer

Rectouterine pouch (pouch of Douglas)

Answer

Uterine cavity (lumen)

Answer

Cervical canal (passage through cervix)

Question 7

Which of the following anatomic boundary separates the true pelvis from the false pelvis?

Accepted Answer

Linea terminalis

Answer

Ischial spine

Answer

Arcuate line

Answer

Pectineal line

Question 8

The anatomical space in the external female genitalia that contains the urethral and vaginal openings is the:

Accepted Answer

Vestibule

Answer

Fossa navicularis

Answer

Labia minora

Answer

Fourchette

Question 9

Bartholin gland opening is at:

Accepted Answer

Inner side of labia minora external to hymen

Answer

Outer side of labia minora internal to hymen

Answer

Outer side of labia minora external to hymen

Answer

Inner side of labia minora internal to hymen

Question 10

A 29-year-old woman with a ruptured ectopic pregnancy is admitted to a hospital for culdocentesis. A long needle on the syringe is most efficiently inserted through which of the following structures?

Accepted Answer

Posterior fornix of the vagina

Answer

Anterior wall of the rectum

Answer

Anterior fornix of the vagina

Answer

Posterior wall of the uterine body

Pelvis and Perineum — MCQs

Pelvis and Perineum — MCQs

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