MCQs of Anatomy of Perineum & External Genitalia.
- The boundaries of the perineum include all the following except:
Tip of the coccyx
- A condensation of fibrous tissue in the female located at the center of the posterior border of the perineal membrane is the:
Posterior labial commissure
- The artery which supplies blood to the major erectile body in both the male and female is the:
Artery of the bulb
Dorsal artery of the penis/clitoris
Deep artery of the penis/clitoris
Posterior labial/scrotal artery
Superficial external pudendal artery
- The vestibular bulbs/bulb of the corpus spongiosum are firmly attached to the:
Superior pubic rami
- The part of the male reproductive tract which carries only semen within the prostate gland is the:
- Which of the following developmental processes is least likely to be involved in the differentiation of male external genitalia from the indifferent state?
Descent of the gonads into the labio-scrotal folds
Fusion of the urogenital folds
Elongation of the phallus
Formation of new erectile bodies
- An intrahepatic blockage of the portal venous outflow may cause intestinal blood to drain via portal-systemic anastomoses into the:
Superior gluteal vein
Middle rectal vein
Inferior phrenic vein
- What part of the ischioanal (ischiorectal) fossa extends deep to the sacrotuberal ligament?
- The perineum is bounded by all of the following skeletal elements except:
spine of ischium
- A 6 mo. old male was brought to the pediatric clinic by his parents because of leakage of urine from the ventral surface of his penis. This congenital condition, hypospadias, is due to incomplete ventral closure of a component of the penis. Which of the below structures would be partially open for urine to take such a course?
Shaft of corpus cavernosum
Shaft of corpus spongiosum
- During childbirth a bilateral pudendal nerve block may be performed to provide anesthesia to the majority of the perineum and the lower one fourth of the vagina. To do this an anesthetic agent is injected near the pudendal nerve as it passes from the pelvic cavity to the perineum. The physician inserts a finger into the vagina and presses laterally to palpate what landmark?
Arcus tendineus levator ani
- During a vaginal delivery, a surgeon performed median episiotomy in which he cut too far (i.e., through the perineal body into the structure immediately posterior). Which perineal structure did he cut?
External anal sphincter muscle
- During a prostatectomy, the surgeon attempts to protect the prostatic plexus of nerves which contains nerve fibers that innervate penile tissue to cause erection. From which nerves do these fibers originate?
Dorsal nerve of the penis
- If the venous drainage of the anal canal above the pectinate line is impaired in a patient with portal hypertension, there may be an increase in blood flow downward to the systemic venous system via anastomoses with the inferior rectal vein, which is a tributary of the:
- A patient complains of a boil located on her labia majora. Lymphatic spread of the infection would most likely enlarge which nodes?
External iliac nodes
Superficial inguinal nodes
Internal iliac nodes
- In order to perform an episiotomy prior to childbirth, the perineum must be anesthetized. By inserting a finger in the vagina and pressing laterally, what palpable bony landmark can be used as the posterior limit of the pudendal canal?
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