4. Seminiferous tubules
Rete testis
Head of epididymis
Body of epididymis
Tail of epididymis
Vas deference
Tunica
albuginea
Tunica
vaginalis
Testis
Vasa efferentia
Dr.Sherif Fahmy
55. PARAMESONEPHRIC DUCTPARAMESONEPHRIC DUCT
Two ducts which are formed by evagination ofTwo ducts which are formed by evagination of
coelomic epithelium.coelomic epithelium.
Cranial end of the duct communicates withCranial end of the duct communicates with
coelomic cavity.coelomic cavity.
It has 3 parts:It has 3 parts:
Cranial vertical partCranial vertical part which lies lateral towhich lies lateral to
mesonephric duct.mesonephric duct.
Middle horizontal partMiddle horizontal part which is ventral towhich is ventral to
mesonephric duct.mesonephric duct.
Caudal vertical partCaudal vertical part which is medial to mesonephricwhich is medial to mesonephric
duct. They are blind caudal ends which lie induct. They are blind caudal ends which lie in
contact with the back of defenitive uro-genital sinus.contact with the back of defenitive uro-genital sinus.
Dr.Sherif Fahmy
56. Congenital AnomaliesCongenital Anomalies
A- Failure of fusion between 2 para-
mesonephric ducts:
- Double uterus and vagina.
- Double uterus and single vagina.
- Double uterus, single cervix and single
vagina.
- Septate uterus.
- Arcuate uterus. Dr.Sherif Fahmy
57. B- Incomplete development of one
uterine tube:
-Unicornuate uterus with rudimentary horn.
C- Failure or incomplete canalization of
paramesonephric ducts:
- Atresia of cervix.
-Atresia of vagina.
-Imperforate hymen.
Dr.Sherif Fahmy
59. DEVELOPMENT OF EXTERNALDEVELOPMENT OF EXTERNAL
GENITAL ORGANGENITAL ORGAN
A-A- Indifferent stage:Indifferent stage:
It starts at the 3It starts at the 3rdrd
week by the appearance of cloacalweek by the appearance of cloacal
folds on both sides of cloacal membrane.folds on both sides of cloacal membrane.
With division of cloacal membrane, cloacal folds divideWith division of cloacal membrane, cloacal folds divide
into genital and anal folds.into genital and anal folds.
B-B- Differentiation:Differentiation:
At the end of 3At the end of 3rdrd
month, genital folds unites anteriorlymonth, genital folds unites anteriorly
to form genital tubercle that form phalus in male andto form genital tubercle that form phalus in male and
clitoris in female. The genital folds become uretheralclitoris in female. The genital folds become uretheral
fold in male and labia minora in female.fold in male and labia minora in female.
Genital swellings appear on both sides of genital foldsGenital swellings appear on both sides of genital folds
that unite together in male forming scrotum andthat unite together in male forming scrotum and
remain separate in female forming labia majora.remain separate in female forming labia majora.
Dr.Sherif Fahmy
63. CONGENITAL ANOMALIESCONGENITAL ANOMALIES
1-1- Hypospadius:Hypospadius: Opening of urethera on lowerOpening of urethera on lower
surface of penis due to failure of fusion of uretheralsurface of penis due to failure of fusion of uretheral
folds.folds.
2-2- Clitoris hypertrophy:Clitoris hypertrophy: overgrowth of genitalovergrowth of genital
tubercle.tubercle.
3-3- Undersized penis:Undersized penis: undergrowth of genital tubercle.undergrowth of genital tubercle.
4-4- Bifid scrotum:Bifid scrotum: failure of fusion of genital swellings.failure of fusion of genital swellings.
5-5- Pseudohermaphrodite:Pseudohermaphrodite: External genitalia belongExternal genitalia belong
to one sex and the gonads belong to the other.to one sex and the gonads belong to the other.
Dr.Sherif Fahmy
