Embryology: Reproductive Systems Practice Questions Flashcards
A 16-year-old girl visits her family physician and reports she has not yet had her first period (menarche). Following examination, the physician suspects a diagnosis of vaginal atresia (absence of vagina). Which of the following is the most likely cause of upper vaginal atresia?
A) Atresia of paramesonephric ducts
B) Atresia of mesonephric ducts
C) Atresia of the urogenital sinus
D) Atresia of sinovaginal bulbs
A
Remnants of the paramesonephric duct in the male will form what structure?
A) Seminal vesicle
B) Paradidymis
C) Appendix epididymis
D) Appendix testis
E) Efferent ductules
D
An individual with a karyotype of 46XY presents with ‘streak gonads’ resulting from underdeveloped gonads. Primordial germ cells must reach the developing gonads in order for gonads to develop. The primordial germ cells migrate to the developing gonads from what location?
A) Paraxial mesoderm
B) Intermediate mesoderm
C) Lateral mesoderm
D) Yolk sac endoderm
D
The labia majora are derived from which of the following structures?
A) Genital tubercles
B) Ductus deferens
C) Paramesonephric ducts
D) Genital swellings
E) Genital folds
D
A seven-year-old boy is taken to the family physician by his mother. His mother explains that her son dribbles urine and his penis looks ‘different’. Upon examination, the physician notes an abnormal opening on the underside or ventral surface of the penis. Which of the following structures most likely did not fuse normally during development?
A) Mesonephric duct
B) Scrotal swellings
C) Urethral folds
D) Genital tubercles
E) Paramesonephric ducts
C
The mesonephric duct in the male contributes to the formation of all of the following except
A) Epididymis
B) Ductus deferens
C) Efferent ductules
D) Seminal gland
C
The efferent ducts (ductuli efferentes) arise from the extratesticular rete.
A 28-year-old woman is diagnosed with a double uterus. Duplication and other abnormalities of the uterus may be explained by
A) Persistence of portions of the mesonephric duct
B) Overextension of the sinovaginal bulbs into the uterine cavity
C) Lack of canalization of the paramesonephric ducts
D) Incomplete fusion of the paramesonephric ducts
D
