Repro System Development

Question 1

Genotype of embryo

Answer 1

determined at Fertilization

Question 2

Phenotype of embryo

Answer 2

Indistinguishable between 1-6 weeks

Complete phenotypic differentiation attained at week 20

Question 3

External Genitalia recognition - Male or Female

Answer 3

By week 12

Question 4

Indifferent gonads form:

Answer 4

Females = Ovaries - in presence of estrogen and absence of testosterone

Males = Testes, Seminiferous tubules, Rete testes- in presence of testosterone

Question 5

Paramesonephric (Mullerian) ducts form:

Answer 5

Uterine tubes in both

Females: uterus, cervix, upper vagina

Males: prostatic utricle, appendix of testes

Question 6

Mesonephric (Wolffian) Ducts form:

Answer 6

Females: Epoophoron (vestigial)

Males: efferent ductules, epididymal duct, ductus deferens, ejaculatory duct, seminal vesicles

Question 7

Urogenital Sinus forms:

Answer 7

Both: Urinary Bladder, Urethra

Females: urethral glands, greater vestibular glands, lower vagina

Males: prostate, bulbourethral glands

Question 8

Genital tubercle/Phallus

Answer 8

Females: Clitoris

Males: Penis

Question 9

Urogenital (urethral) folds/ridges

Answer 9

Females: labia minora

Males: spongy urethra of penis

Question 10

Labioscrotal (genital) swellings

Answer 10

Females: Labia majora

Males: Scrotum

Question 11

Descent of Gonads

Answer 11

Ovaries & Testes are intra-abdominally located during intrauterine life

Later descend w/ help of Gubernaculum & Processus Vaginalis

Females - Ovaries:

• descend into pelvis
• gubernaculum forms ovarian ligament + round ligament of uterus
• processus vaginalis forms no adult structure in females

Males- Testes:

• descend into scrotum
• gubernaculum forms gubernaculum Testes in males
• processus vaginalis forms tunica vaginalis testis in males