1056
UNIT 5
Continuity
27
Ovaries
Paramesonephric
duct (degenerating)
Testes
Mesonephric duct
forming the ductus
deferens
Urinary bladder
Seminal gland
Urogenital sinus
forming the urethra
Epididymis
Efferent ductules
Testis
Penis
Urinary bladder
Seminal gland
Epididymis
Urethra
Ductus deferens
Bulbo-urethral gland
Prostate
Efferent ductules
7- to 8-week male
Mesonephros
Gonadal ridge
Metanephros
(kidney)
5- to 6-week embryo:
sexually indifferent stage
At birth: male development
8- to 9-week female
At birth: Female development
Paramesonephric
duct forming the
uterine tube
Mesonephric duct
(degenerating)
Mesonephric
(Wolffian) duct
Paramesonephric
(Müllerian) duct
Cloaca
SRY
Uterine tube
Ovary
Uterus
Urinary bladder
(moved aside)
Vagina
Hymen
Vestibule
Urethra
Fused
paramesonephric
ducts forming
the uterus
Urinary bladder
(moved aside)
Urogenital sinus
forming the urethra
and lower vagina
SRY
Figure 27.23
Development of the internal reproductive organs.
(
SRY
5
sex-determining
region of the Y chromosome.)
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