Anatomy Perineum –pelvis BRS - Part 2

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  • 1/26 Questions

    An obstetrician is about to perform a pudendal block so a woman can experience less pain when she delivers her child. He recalls what he learned in medical school about this nerve:

    • It passes superficial to the sacrotuberous ligament
    • It innervates the testis and epididymis in a male
    • It provides motor fibers to the coccygeus
    • It can be blocked by injecting an anesthetic near the inferior margin of the ischial spine
    • It arises from the lumbar plexus
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Anatomy Perineum pelvis BRS - Part 2 - Quiz
About This Quiz

This advanced quiz, titled 'Anatomy PERINEUM \u2013PELVIS BRS - Part 2', assesses knowledge on the anatomy of the perineum and pelvis, focusing on surgical considerations, nerve and ligament identification, and implications in medical procedures like vasectomy and childbirth. It is crucial for medical students and professionals in surgical and gynecological specialties.

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  • 2. 

    A 37-year-old woman complains of a bearing-down sensation in her womb and an increased frequency of and burning sensation on urination. On examination by her gynecologist, she is diagnosed with the uterine prolapse. Which of the following structures provides the primary support for the cervix of the uterus?

    • External anal sphincter

    • Broad ligament of the uterus

    • Cardinal (transverse cervical) ligament

    • Round ligament of the uterus

    • Suspensory ligament of the ovary

    Correct Answer
    A. Cardinal (transverse cervical) ligament
    Explanation
    The cardinal (transverse cervical) ligament provides the major ligamentous
    support for the uterus. The sphincter ani externus does not support the uterus. The broad and
    round ligaments of the uterus provide minor supports for the uterus. The suspensory ligament of
    the ovary does not support the uterus.

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  • 3. 

    A 78-year-old man has carcinoma of the rectum. The cancer is likely to metastasize via the veins into which of the following structures?

    • Spleen

    • Kidney

    • Liver

    • Duodenum

    • Suprarenal gland

    Correct Answer
    A. Liver
    Explanation
    Cancer cells from the rectal cancer are likely to metastasize to the liver via
    the superior rectal, inferior mesenteric, splenic, and portal veins. Cancer cells are not directly
    spread to the other organs listed. The spleen and duodenum drain their venous blood to the portal
    venous system and the kidney and suprarenal gland empty into the caval (inferior vena cava)
    system.

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  • 4. 

    A neurosurgeon performs surgical resection of a rare meningeal tumor in the sacral region. He tries to avoid an injury of the nerve that arises from the lumbosacral plexus and remains within the abdominal or pelvic cavity. To which of the following nerves should he pay particular attention?

    • Ilioinguinal nerve

    • Genitofemoral nerve

    • Lumbosacral trunk

    • Femoral nerve

    • Lateral femoral cutaneous nerve

    Correct Answer
    A. Lumbosacral trunk
    Explanation
    The lumbosacral trunk is formed by part of the ventral ramus of the fourth
    lumbar nerve and the ventral ramus of the fifth lumbar nerve. This trunk contributes to the formation
    of the sacral plexus by joining the ventral ramus of the first sacral nerve in the pelvic cavity
    and does not leave the pelvic cavity. All other nerves leave the abdominal and pelvic cavities.
    The ilioinguinal nerve accompanies the spermatic cord or the round ligament of the uterus, continues
    through the inguinal canal, and emerges through the superficial inguinal ring. The genitofemoral
    nerve divides into a genital branch, which enters the inguinal canal through the deep
    inguinal ring and exits through the superficial inguinal ring and supplies the cremaster muscle
    and the scrotum or labium majus, and a femoral branch, which passes deep to the inguinal ligament
    and enters the femoral triangle. The femoral nerve enters the femoral triangle deep to the
    inguinal ligament and lateral to the femoral vessels and divides into numerous branches. The lateral
    femoral cutaneous nerve runs in front of the iliacus and behind the inguinal ligament and
    innervates the skin of the anterior and lateral thigh.

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  • 5. 

    After repair of a ruptured diverticulum, a 31-year-old patient begins to spike with fever and complains of abdominal pain. An infection in the deep perineal space would most likely damage which of the following structures?

    • Ischiocavernosus muscles

    • Superficial transverse perineal muscles

    • Levator ani

    • Sphincter urethrae

    • Bulbospongiosus

    Correct Answer
    A. Sphincter urethrae
    Explanation
    The sphincter urethrae is found in the deep perineal space, whereas the
    other structures are located in the superficial perineal space.

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  • 6. 

    A radiologist interprets a lymphangiogram for a 29-year-old patient with metastatic carcinoma. Upper lumbar nodes most likely receive lymph from which of the following structures?

    • Lower part of the anal canal

    • Clitoris

    • Labium majus

    • Testis

    • Scrotum

    Correct Answer
    A. Testis
    Explanation
    Lymphatic vessels from the testis and epididymis ascend along the testicular
    vessels in the spermatic cord through the inguinal canal and continue upward in the abdomen
    to drain into the upper lumbar nodes. The lymph from the other structures drains into
    the superficial inguinal lymph nodes.

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  • 7. 

    A trauma surgeon in the emergency room at a local center examines a 14-year-old boy with extensive pelvic injuries after a hit and run accident. The surgeon inspects the ischiorectal fossa because it:

    • Accumulates urine leaking from rupture of the bulb of the penis

    • Contains the inferior rectal vessels

    • Has a pudendal canal along its medial wall

    • Is bounded anteriorly by the sacrotuberous ligament

    • Contains a perineal branch of the fifth lumbar nerve

    Correct Answer
    A. Contains the inferior rectal vessels
    Explanation
    The ischiorectal fossa is bounded posteriorly by the gluteus maximus and
    the sacrotuberous ligament. It contains fat, the inferior rectal nerve and vessels, and perineal
    branches of the posterior femoral cutaneous nerve. The pudendal canal runs along its lateral wall.
    Urine leaking from a ruptured bulb of the penis does not spread into the ischiorectal fossa because
    Scarpa's fascia ends by firm attachment to the fascia lata of the thigh.

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  • 8. 
    A stab wound immediately superior to the pubic symphysis on the anterior pelvic wall would most likely injure which visceral organ first? - ProProfs

    A stab wound immediately superior to the pubic symphysis on the anterior pelvic wall would most likely injure which visceral organ first?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. C
    Explanation
    The bladder is situated in the anterior part of the pelvic cavity. Thus, a stab
    wound superior to the pubic symphysis would injure the bladder

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  • 9. 

    A woman is delivering a breech baby. The obstetrician decides it is best to perform a mediolateral episiotomy. Which of the following structures, should the obstetrician avoid incising?

    • Vaginal wall

    • Superficial transverse perineal muscle

    • Bulbospongiosus

    • Levator ani

    • Perineal membrane

    Correct Answer
    A. Levator ani
    Explanation
    An obstetrician should avoid incising the levator ani and the external anal
    sphincter. The levator ani is the major part of the pelvic diaphragm, which forms the pelvic floor
    and supports all of the pelvic organs. None of the other choices applies here.

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  • 10. 

    A 32-year-old man undergoes vasectomy as a permanent birth control. A physician performing the vasectomy by making an incision on each side of the scrotum should remember  which of the following statements is most applicable to the scrotum?

    • It is innervated by the ilioinguinal and genitofemoral nerves

    • It receives blood primarily from the testicular artery

    • Its venous blood drains primarily into the renal vein on the left

    • Its lymphatic drainage is primarily into upper lumbar nodes

    • Its dartos tunic is continuous with the perineal membrane

    Correct Answer
    A. It is innervated by the ilioinguinal and genitofemoral nerves
    Explanation
    The scrotum is innervated by branches of the ilioinguinal, genitofemoral,
    pudendal, and posterior femoral cutaneous nerves. The scrotum receives blood from the posterior
    scrotal branches of the internal pudendal arteries and the anterior scrotal branches of the external
    pudendal arteries, but it does not receive blood from the testicular artery. Similarly, the scrotum
    is drained by the posterior scrotal veins into the internal pudendal vein. The lymph vessels
    from the scrotum drain into the superficial inguinal nodes, whereas the lymph vessels from the
    testis drain into the upper lumbar nodes. The dartos tunic is continuous with the membranous
    layer of the superficial perineal fascia (Colles' fascia).

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  • 11. 

    During pelvic surgery, a surgeon notices severe bleeding from the artery that remains within the true pelvis. Which of the following arteries is most likely to be injured?

    • Iliolumbar artery

    • Obturator artery

    • Uterine artery

    • Internal pudendal artery

    • Inferior gluteal artery

    Correct Answer
    A. Uterine artery
    Explanation
    Of all the arteries listed, the uterine artery remains within the pelvic cavity.

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  • 12. 

    A 26-year-old man comes to a hospital with fever, nausea, pain, and itching in the perineal region. On examination by an urologist, he is diagnosed as having infected bulbourethral (Cowper's) glands. Which of the following structures is affected by this infection?

    • Superficial perineal space.

    • Sphincter urethrae.

    • Production of sperm.

    • Testis

    • Seminal vesicles

    Correct Answer
    A. Sphincter urethrae.
    Explanation
    The bulbourethral glands lie on either side of the membranous urethra, embedded
    in the sphincter urethrae. Their ducts open into the bulbous part of the penile urethra.
    Semen—a thick, yellowish white, viscous, spermatozoa-containing fluid—is a mixture of the secretions
    of the testes, seminal vesicles, prostate, and bulbourethral glands. Sperm, or spermatozoa,
    are produced in the seminiferous tubules of the testis and matured in the head of the epididymis.
    The seminal vesicles are lobulated glandular structures, produce the alkaline constituent
    of the seminal fluid that contains fructose and choline, and lie inferior and lateral to the ampullae
    of the ductus deferens against the fundus (base) of the bladder.

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  • 13. 

    A 22-year-old victim of an automobile accident has received destructive damage to structures that form the boundary of the perineum. Which of the following structures is spared?

    • Pubic arcuate ligament

    • Tip of the coccyx

    • Ischial tuberosities

    • Sacrospinous ligament

    • Sacrotuberous ligament

    Correct Answer
    A. Sacrospinous ligament
    Explanation
    The sacrospinous ligament forms a boundary of the lesser sciatic foramen.
    The pubic arcuate ligament, tip of the coccyx, ischial tuberosities, and sacrotuberous ligament all
    form part of the boundary of the perineum

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  • 14. 

    A general surgeon is giving a lecture to a team of surgery residents. She describes characteristics of structures above the pectinate line of the anal canal, which include

    • Stratified squamous epithelium

    • Venous drainage into the caval system

    • Lymphatic drainage into the superficial inguinal nodes

    • Visceral sensory innervation

    • External hemorrhoids

    Correct Answer
    A. Visceral sensory innervation
    Explanation
    The pectinate line is a point of demarcation between visceral and somatic
    portions of the anal canal. Characteristics above the pectinate line include columnar epithelium,
    venous drainage into the portal system, lymphatic drainage into the internal iliac nodes, visceral
    sensory innervation, and internal hemorrhoids.

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  • 15. 

    A 21-year-old man is involved in a highspeed motor vehicle accident. As a result, he has extensive damage to his sphincter urethrae. Which of the following statements best explains the injured sphincter urethrae?

    • Smooth muscle

    • Innervated by the perineal nerve

    • Lying between the perinea] membrane and CoIles' fascia

    • Enclosed in the pelvic fascia

    • Part of the pelvic diaphragm

    Correct Answer
    A. Innervated by the perineal nerve
    Explanation
    The sphincter urethrae is striated muscle that lies in the deep perineal space
    and forms a part of the urogenital diaphragm but not the pelvic diaphragm. It is not enclosed in
    the pelvic fascia. It is innervated by a deep (muscular) branch of the perineal nerve.

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  • 16. 
     Into which structure does hemorrhage occur after injury to the inferior rectal vessels? - ProProfs

     Into which structure does hemorrhage occur after injury to the inferior rectal vessels?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. E
    Explanation
    The ischiorectal fossa lies in the anal triangle and is bound laterally by the
    obturator internus with its fascia and superomedially by the levator ani and external anal sphincter.
    It contains the inferior rectal vessels. Thus, hemorrhage occurs in the ischiorectal fossa when
    it is ruptured.

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  • 17. 

    An elderly man with prostatitis is seen at an internal medicine clinic. The seminal colliculus of his prostate gland is infected, and its fine openings are closed. Which of the following structures is most likely to be disturbed?

    • Ducts of the prostate gland

    • Prostatic utricle

    • Ducts of the bulbourethral glands

    • Ejaculatory ducts

    • Duct of the seminal vesicles

    Correct Answer
    A. Ejaculatory ducts
    Explanation
    The ejaculatory ducts, which open onto the seminal colliculus, may be
    injured. The prostate ducts open into the urethral sinus, the bulbourethral ducts open into the
    bulbous part of the penile urethra, and the ducts of the seminal vesicle join the ampulla of the
    ductus deferens to form the ejaculatory duct. The prostatic utricle is a minute pouch on the summit
    of the seminal colliculus.

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  • 18. 
    In which structure would ligation of the external iliac artery reduce blood pressure? - ProProfs

    In which structure would ligation of the external iliac artery reduce blood pressure?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. A
    Explanation
    The external iliac artery becomes the femoral artery immediately after passing
    the inguinal ligament. Therefore, ligation of the external iliac artery reduces blood pressure
    in the femoral artery.

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  • 19. 

    A 49-year-old woman has a large mass on the pelvic brim. Which of the following structures was most likely compressed by this mass when crossing the pelvic brim?

    • Deep dorsal vein of the penis

    • Uterine tube

    • Ovarian ligament

    • Uterine artery

    • Lumbosacral trunk

    Correct Answer
    A. Lumbosacral trunk
    Explanation
    All of the listed structures do not cross the pelvic brim except the lumbosacral
    trunk, which arises from L4 and L5, enters the true pelvis by crossing the pelvic brim,
    and contributes to the format ion of the sacral plexus. The deep dorsal vein of the penis enters the
    pelvic cavity by passing under the symphysis pubis between the arcuate and transverse perineal
    ligaments.

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  • 20. 
    Which structure has Houston's valve or fold, with its venous blood drained by the portal venous system? - ProProfs

    Which structure has Houston's valve or fold, with its venous blood drained by the portal venous system?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. C
    Explanation
    The mucous membrane and the circular smooth muscle layer of the rectum
    form three transverse folds; the middle one is called Houston's valve. The venous blood returns
    to the portal venous system via the superior rectal vein.

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  • 21. 
    Which structure is innervated by the nerve  passing through both the greater and lesser sciatic foramina? - ProProfs

    Which structure is innervated by the nerve  passing through both the greater and lesser sciatic foramina?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. B
    Explanation
    The answer is B. The obturator internus muscle and its fascia form the lateral wall of the ischiorectal
    fossa. This muscle is innervated by the nerve to the obturator internus, which passes
    through the greater and lesser sciatic foramen.

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  • 22. 
    Which structure secretes fluid containing fructose, which allows for forensic determination of rape? - ProProfs

    Which structure secretes fluid containing fructose, which allows for forensic determination of rape?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. B
    Explanation
    The seminal vesicle is a lobulated glandular structure and produces the alkaline
    constituent of the seminal fluid, which contains fructose and choline. Fructose, which is
    nutritive to spermatozoa, also allows forensic determination of rape, whereas choline crystals are
    the preferred basis for the determination of the presence of semen.

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  • 23. 
    Which structure in the female that is much shorter than that in the male? - ProProfs

    Which structure in the female that is much shorter than that in the male?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. A
    Explanation
    In females, the urethra extends from the bladder, runs above the anterior
    vaginal wall, and pierces the urogenital diaphragm to reach the urethral orifice in the vestibule
    behind the clitoris. It is about 4 cm long. In males, the urethra is about 20 cm long.

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  • 24. 
    Which structure, when fractured, results in paralysis of the obturator internus muscles? - ProProfs

    Which structure, when fractured, results in paralysis of the obturator internus muscles?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. E
    Explanation
    The greater trochanter provides an insertion site for the obturator internus
    muscle.

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  • 25. 
    Which structure extends between the vestibule and the cervix of the uterus and serves as the excretory channel for the products of menstruation? - ProProfs

    Which structure extends between the vestibule and the cervix of the uterus and serves as the excretory channel for the products of menstruation?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. D
    Explanation
    The vagina is the genital canal in the female, extending from the vestibule
    to the uterine cervix. The vagina transmits the products of menstruation and receives the penis
    in copulation.

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  • 26. 
    A knife wound to the obturator foramen might injure which structure? - ProProfs

    A knife wound to the obturator foramen might injure which structure?

    • A

    • B

    • C

    • D

    • E

    Correct Answer
    A. E
    Explanation
    The obturator foramen transmits the obturator nerve and vessels. Therefore,
    the knife wound in this foramen injures the obturator nerve and vessels.

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  • Mar 21, 2023
    Quiz Edited by
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  • Jan 05, 2012
    Quiz Created by
    BLACKMD
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