Question at position 5 The penis is homologous to which structure of the female reproductive apparatus?labia minoraclitorislabia majoravagina单项选择题
A
labia minora
B
clitoris
C
labia majora
D
vagina

Question

Question at position 5 The penis is homologous to which structure of the female reproductive apparatus?labia minoraclitorislabia majoravagina

BlackTom AI · Accepted Answer

Embryologically, the penis develops from the genital tubercle, so its true female homologue is the structure that arises from the same embryonic primordium: the clitoris.

1) Relevant knowledge points and concepts
- External genitalia in both sexes arise from the same embryonic structures: genital tubercle, urogenital (urogenital) folds, and labioscrotal swellings.
- The genital tubercle becomes the glans and corpora cavernosa of the penis in males and the glans and corpora cavernosa of the clitoris in females.
- Urogenital folds form the penile urethra (and ventral shaft) in males and the labia minora in females.
- Labioscrotal swellings form the scrotum in males and the labia majora in females.
- The vagina derives mainly from the paramesonephric (Müllerian) ducts and the urogenital sinus, not from the genital tubercle.

2) Step-by-step reasoning
- Identify embryonic origins: genital tubercle → penis (male) and clitoris (female).
- Match adult structures derived from same primordium: glans penis ↔ glans clitoris; corpora cavernosa of penis ↔ corpora cavernosa of clitoris.
- Therefore the penis is homologous to the clitoris.

3) Intermediate “mapping” steps
- Genital tubercle → penile glans/corpora cavernosa OR clitoral glans/corpora cavernosa.
- Urogenital folds → penile urethra (males) OR labia minora (females).
- Labioscrotal swellings → scrotum (males) OR labia majora (females).
- Vagina → paramesonephric ducts/urogenital sinus (different origin).

4) Why the correct answer is correct
Because both penis and clitoris originate from the genital tubercle and share homologous erectile structures (corpora cavernosa and glans), the clitoris is the homologous female structure to the penis.

5) Why the other options are incorrect
- Labia minora originate from urogenital folds, not the genital tubercle, so they are homologous to the penile shaft/urethral folds rather than the penis itself.
- Labia majora arise from labioscrotal swellings and are homologous to the scrotum, not the penis.
- Vagina is derived from Müllerian ducts and urogenital sinus tissue, so it is not homologous to the penis.

Conclusion: The correct homologous structure is the clitoris, matching the provided answer.

Question at position 5 The penis is homologous to which structure of the female reproductive apparatus?labia minoraclitorislabia majoravagina单项选择题

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